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Old 05-01-2012, 03:37 PM
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multi misfire

I have a 99 base 5sd and im getting a bad misfire. Getting cel and codes are for misfire #s1234 and the multi only no other codes. Plugs are new, wires are new. Getting good spark. Reset the computer butch of times already. Problem only started when i got it back togeather after cleaning the egr ports. I pulled the intake off the car when i done it. Also gasket matched the intake and cleaned the injectors. Knock sensor had gotten messed up and so i put a new one on to.
Only runs decent for maybe 30seconds after a cold start then when the idle drops to normal it misses and runs like DOOKIE. Engine light blinks to. timing belt was done 2months ago.
What could it be Ive pulled the intake twice and everything looks good.
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Old 05-01-2012, 03:54 PM
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Re: multi misfire

did you clean the egr and hook up the egr solenoid hoses to the correct ports?


I know the car runs like complete crap if you swap those solenoid hoses that lead from the driver side shock tower - to the intake manifold.
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Old 05-01-2012, 04:10 PM
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Re: multi misfire

NEED HELP ASAP. Seems to be more on #2 i think. I pullued the wire off it while it was running and there was no change. if i do that to 134 i runs worse.
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Old 05-01-2012, 04:12 PM
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Re: multi misfire

yeah those lines are all good
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Old 05-01-2012, 05:11 PM
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Re: multi misfire

just did a com check. got 1. 175 2. 175 3. 178 4. 180
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Old 05-01-2012, 07:18 PM
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Re: multi misfire

Did you use a new Honda gasket - or an aftermarket?

If an aftermarket, did it have the hole cut out for the egr? (you would be throwing an egr code, but figured i'd ask anyway since egr issues can relate to misfires)


Are your sparkplug wires hooked up to the distributor in the proper order?


Double check your spark plugs....


Your car ran fine prior to doing this - correct?

Have you checked the cap for signs of wear? - could be a coincidence for that to go bad at this time
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Old 05-01-2012, 07:59 PM
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Re: multi misfire

Used Honda gaskets with the egr hole. i had pulled the intake twice after it didnt run right the first time but everything was good. yeah the plug wires are all good and new. i never messed with them until it wouldnt run right. i replaced the coil the other day resset the ecm still got the same problems. tried blocking the egr just to see but no change either. Crazy thing is it idles at 750rpms with all the misfire. ive checks all vac lines, ground wires and every plug. Tried new map no change either. Could a TPS do all this BS, INJECTORS or anything else. IM stumped and the Honda dealer has no clue either but they want me to bring it for diagnostics-(200BUCKS)
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Old 05-01-2012, 09:04 PM
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Re: multi misfire

Check the cap for the sequence. I did that on my prelude, #2/3 were backwards on the cap. Could also be the distributor is on its way out. Coil giving enough punch to ignite the sparks? Water on gas/wrong octane?
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Old 05-01-2012, 09:04 PM
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Re: multi misfire

Stoopid cellular 3G junk. If those problems are good, I would definitely check the PCV to see if it's clogged or if it's your oxygen sensor. I'm grasping at straws here because you need a complete rundown of what you did to see if any flags come up. Just to be safe, you should get another egr to see if that doesn't solve the problem. Autozone or pepboys where you can return the item.
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Old 05-01-2012, 10:14 PM
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Re: multi misfire

gas is good 91oct. wires are def in the right spot. bank 1 o2 is 2 months old. pcv is new and working. im leaning on a bad iacv or tps or fuel problem. Its just all crazy cause it ran fine until i pulled the intake. ive read crazy stuff where people just throw a ton of parts at it and nothing is fixed. any info is good info thow. think ima pull the screens outa the injectors and see if it helps. Oh yeah i did the dead head thing to and that didnt have any change what so ever. thought it would idle up some. I bet its got to be somthing small and easy to over look.
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Old 05-02-2012, 09:30 AM
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Re: multi misfire

I would say it is probably something with the distributor. However, when I replaced my intake manifold gasket, one of the retainer clips broke that holds the electrical connector onto one of my injectors. I just plugged it in best I could and about a week later it popped out and I was having a misfire. Might be something to check out. Or you could just have bad injectors period.
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Old 05-02-2012, 11:33 AM
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Re: multi misfire

I'm in the same boat, so I know how you feel. Except mine is either valves/seals or rings :( (See the link in my sig.)

So you removed the entire intake manifold, I take it you had to disconnect the coolant lines to the IACV and FITV. Stupid question, but did you bleed the coolant system properly and refill the radiator? That will cause a bad idle, and possibly misfire codes (from IACV not working properly). There are tests you can do to determine if your IACV is bad, it's in the manual. How do your spark plugs look? Are they fouled at all (rich-black, lean-white)? Also, check for vacuum leaks, either in a line or around the gasket. A spray bottle with soapy water works best, you will see bubbles if/where there is a leak.

EDIT: Noticed you just said "intake" and not "intake manifold," so I don't know if you just mean the intake plenum or the entire manifold.
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Old 05-02-2012, 02:33 PM
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Re: multi misfire

Ive sprayed everywhere a vac line goes and all around the intake. I pulled the plug for the tps while it was running and there was no change. Thought it would get worse or idle bad? If i pull the iacv it dies. i pulled the map it dies. But does the computer aim for cyl #2 when something specific goes wrong? Seems to be the common one to go bad or misfire. This Sucks a big fat one. I dont like taking anything to a shop but looks like a good option im just getting tired. gonnna check fuel pressure and test the injectors and move them around and test a few dosen wires on the harness
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Old 05-02-2012, 07:25 PM
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Re: multi misfire

4 months ago i took it to a car wash and degreased the motor and top of the tranny. (had oil leaks when i bought it.) it bucked while driving it til it dried good. like as if it lost spark for half a second. wounder if it could be same thing but more constant now?
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Old 05-02-2012, 07:44 PM
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Re: multi misfire

So did you remove just the intake or the entire manifold? How do the spark plugs look, are any of them fouled? More than likely when you cleaned the engine, water made its way into the distributor cap, or sat in a sensor.
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Old 05-02-2012, 11:59 PM
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Re: multi misfire

i removed the intake manifold twice. took it apart cleaned the b plates, gasket matched it and painted it. (plugs are dry but black now!?) i had a 92 supra that did this once that turned out to be a ground under the intake that i forgot to hook up. Anyone ever clean there injectors using the- carb cleaner can, baby med syringe, 9v battery trick? looks nifty or would that F*** my injectors?
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Old 05-03-2012, 06:34 PM
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Re: multi misfire

Guess what my battery is located to the trunk and i have a switch hooked up to cut total power from it instead of pulling cables off to cut the power. only used it a few times but now the switch turns out to be bad and doesnt cut my power off anymore so all means i do believe when i pulled the intake manifold off and unplugged my map,coil, tps, egr, iac, knock sensor and air pressure sensors they still had power to them.
So what can you mess up if you dont unhook the battery when pulling these? main relay, icm???????

somthings gotta be fried somwhere and i did end up pulling the battery cable off and reset the computer yet no change. checked all fuses to.
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Old 05-03-2012, 07:25 PM
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Re: multi misfire

I've been working in a repair shop for almost three years and I've never had to disconnect the battery to replace a sensor of any kind. If they car is off (and it kinda has to be to remove the intake manifold) then the sensors don't have power going to them. So none of them should have been fried when disconnecting them.

That being said, your problem definitely sounds electrical. Before spending huge dollars taking to someone else, do a complete sweep of the entire circuit with a meter.

1. Check each spark plug for spark. Pull one, hold it with a pair of pliers so the tip is against a grounded point of the engine and turn over the engine. If each one sparks properly and consistently, with no fades or misses, you can rule out the plugs and wires.

2. Check the voltage from the distributor. I once had a problem of my other car dying for no good reason; it turned out to be a faulty wire inside the distributor - took me WEEKS to find the problem.

3. If all is good with the electrical, then check the fuel. Start by having the injectors cleaned. This is relatively inexpensive and should be done regardless from time to time as it helps with gas mileage and general performance of the engine.

4. If the fuel is good, then check the air intake system. Make sure that the air to the engine is clean and smooth flow.

I know I've probably listed a bunch of stuff that you've long-since checked, but there are only three things required for any engine to run properly: gas, air, spark. If one of these is not right, the engine will not run right. Yes, I know it sounds ridiculously obvious. Sometimes the obvious is what is commonly overlooked.

Please update this thread with any progress. I'm going to bring this problem up with my boss - he's been a mechanic for about 15 years and his specialty is diagnosing weird problems.
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Old 05-03-2012, 08:11 PM
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Re: multi misfire

when i pull plug wire for cyl #2 it has no change but i got spark there. Now i dont know if its a good spark or bad spark. If i pull 134 it misses realy bad. my compression is good. So it has alot to do with cyl #2 or somthing screws cyl #2 up that my friend idk. Like wise it idles good but with a misfire and you can feel it.
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Old 05-03-2012, 08:26 PM
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Re: multi misfire

It's possible that #2 is missing under compression. It's harder for a spark plug to fire when in the cylinder than when out in the open. Start with the simple: change the plug and the one wire (use the old one if you have it as a test). You may simply have a single faulty plug or wire. If that doesn't solve it, then the problem is earlier ON THE SAME LINE. You've narrowed the problem down to #2 cylinder. Somewhere between the coil and the plug, that electrical signal is dying out. How's the cap? Any burnt terminals? How old is it?
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Old 05-03-2012, 10:00 PM
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Re: multi misfire

ima buy a new cap and rotor this weekend. i ve cleaned the plugs tried different gaps in them and swapped them around. no change at all. would bad icm do it?
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Old 05-04-2012, 08:48 PM
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Re: multi misfire

ima try a friends computer and dizy and tons of other things and see if it works any better this weekend. Ill check back in and let yall know if it works or not. if you got ANY good ideas let me know.
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Old 05-04-2012, 09:56 PM
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Re: multi misfire

Do you have a service manual? No, I'm not trying to be a smart-ass. The specs for things like plug gaps is set and is one of those things that remains a constant in the equation of "what the h3ll is wrong with my car?"

Definitely update the thread after the weekend. If the new dizzy, computer, etc change anything, let us know. If it fixes the problem, then whatever you changed right before the problem was fixed was the solution. In other words, change one thing, test it, change it back and change the second thing, test it, change it back, etc, etc. If one of those changes solves the missing, there's the culprit.
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Old 05-05-2012, 12:50 AM
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Re: multi misfire

No i dont but i wish i had one. But yeah i was gonna try the dizy 1st, his known good injectors 2nd and valve lash adjustment 3rd his trottle body 4th if it still failed to stop the misfire then the computer 5th. test a ton of wires.
This will be done if the above does not work! I do have a big suspicion about the alternator and starter causing any kind of electrical issues that get over looked cause they work fine! Could be some kinda foul play with one or the other.
I want to pull the hot wires to the alternator and or unground it but still run it and test some circuits out and then start my car but then disconnect the hot wires to the starter and then retest some wires. Basically ill just be running the car off the battery. I know i could just pull fuses but i want to know the exact location of any problem.
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Old 05-06-2012, 12:34 AM
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Re: multi misfire

PROBLEM FIXED!!!
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Old 05-06-2012, 12:57 AM
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Re: multi misfire

WARNING ---BE VERYYYYYY CAREFUL TRYING THIS AT HOME- PLEASE KEEP A FIRE EXTINGUISHER NEAR BY FOR SAFETY REASONS! THIS CAN VERY WELL START A FIRE! SO PLEASE JUST BE SAFE FIRST! AND NO SMOKING WHEN YOU DO THIS EITHER!

Ok the #2 injector wasnt closing all the way as a result in flooding #2 cyl and a big drop in fuel pressure causing the multi misfire. Way i found this all out was I pulled the fuel rail off with EVERYTHING connected to it still and aimed it up so i could see the tips had my wife turn the key-power on (injectors wont spray until you turn engine over) so fuel pump comes on and i had her turn it over for a SECOND so i can watch them spray ( stand back a bit when you do this) so i look at them close with the power on and gas is still coming out only of #2 injector look close and youll see if its leaking dry the ends and turn just the pump on a few times if the tips get wet again then there leaking. Well to temp fix it i ran cleaner threw it and i moved #2 injector to the #4 cyl so its last in line to get gas. AS OF NOW NO MISFIRE AND NO CEL-ENGINE LIGHT. BUT Im buying 4 new injectors!
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Old 05-06-2012, 01:01 AM
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Re: multi misfire

or you can take the injectors out and send them off to be pressure and flow tested.
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Old 05-06-2012, 11:14 AM
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Re: multi misfire

Glad to hear you got it fixed. Well done.
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