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My 1399,300,301,302 Misfire Culprit........

 
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Old 01-21-2012, 11:52 PM
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My 1399,300,301,302 Misfire Culprit........

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But now I'm stuck with a mysterious P0131 (primary o2 sensor). Cleaning the EGR system, allowed for a leaner condition in the engine. I am hoping that a bad (low voltage/lean biased) sensor, is the reason for the o2 code. I just hope what I'm seeing is not a false o2 code (from a carbon sooted o2 sensor), as a result of another underlying factor, that is causing a rich condition


p.s I lost the 6th plug

Last edited by zadeh79; 01-21-2012 at 11:57 PM.
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Old 01-24-2012, 01:29 AM
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Re: My 1399,300,301,302 Misfire Culprit........

oh **** just looking at their estimates for the suggested services make me cringe...
glad you found out whats wrong with your engine, best of luck to you man.

i cleaned out the egr ports myself last summer, cost about 4 bucks total. I did break a screw in half, lost it in the IM, and had to take off the top half of the IM to fish it out, but it was a good experience.
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Old 01-24-2012, 10:27 AM
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Re: My 1399,300,301,302 Misfire Culprit........

I'm going to do the EGR ports soon on our prelude, just cleaned the EGR valve this past weekend.


Some of those estimates look a little high....

I just had front struts replaced with alignment for $300 at a local shop in Pensacola.

Front brake pads....pretty easy to replace, and you can take your rotors to O'reilly or somewhere to get them turned pretty cheap, just the cost of pads, caliper grease and rotor turning if you DIY, should be $100 or less depending on brake pads you get.

Not sure about the rest....and that wasn't the point of this thread, sorry, just balked a little at some of those estimates, lol.
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Old 01-24-2012, 11:18 PM
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Re: My 1399,300,301,302 Misfire Culprit........

I think I have the same problem...

I noticed some stumbling at idle when I parked after a 5minute drive to work. Tonight after work I started the car and got a cel. Grabbed my scanner and had a misfire on cyl1. Started driving out the parking lot and the CEL started blinking. Misfires on Cylinder 1,2, and 4. Random Misifres. EGR low flow codes.

Does a clogged egr cause all these misfires?

I had my timing belt, water pump, and all seals replaced two weeks ago.

Replaced primary o2 sensor 1,000 miles ago. I had a o2 sensor slow response code.

I just did a compression test and it is 200, 195, 195, 190
1999 Prelude MT Base 181,000 miles

Last edited by foose; 01-24-2012 at 11:21 PM.
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Old 01-25-2012, 04:38 PM
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Re: My 1399,300,301,302 Misfire Culprit........

FOOSE :

Here is something to look for. If the EGR is your problem, the car will misfire A) after the car has reached normal operating temperature, and B) at lower RPM/load. This means, if the EGR is to blame, every time your CEL is blinking, if you advance the throttle, the blinking CEL should go away (and turn into a constant CEL). If this is the case (and especially if your getting a p300 or p1399,or multiple cylinder misfires), you likely need your EGR system cleaned. According to the factory service manual, with low rpm misfiring, the EGR is (statistically) the prime suspect.




In your case, it definitely sounds like your EGR valve/ports need to be cleaned. It's even throwing the EGR low flow code (although the valve itself will not cause the misfire), suggesting there is blockage in the system. It's also worth noting that o2 sensor issues, are often related to EGR problems. If your a DIY'er , you can get it done for a few dollars, otherwise most shops will charge you between $150 and $200.



Misfires can occur for a number of reasons. A few weeks ago, the ignition wire and coil were replaced, to fix my p301 misfire. Then I was getting misfires through all but one cylinder. The problem was the EGR.



With the coil/wire/cap/rotor replaced, and the EGR system cleaned (at a cost of $800) my car just drove 31 continuous miles, without a misfire (or pending code). Let's just hope it's all good.

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Old 02-09-2012, 07:54 PM
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Re: My 1399,300,301,302 Misfire Culprit........

I am having the same issue! I have a 98 Lude SH and the CEL's are a P301 cylinder 1 misfire and a p1399 multiple cylinder misfire, and is either bad EgR or needs valve adjustment. I've check spark plugs, wires, cap and rotor, injectors, and the egr valve. The EGR valve was junked up with carbon so i cleaned it and now the misfire sounds even more prevalent. The car has just had a new distributor, Head Gasket, valve adjustment, timing belt, and water pump... If you resolved your issue or is anybody could shed some light on my problem it would be greatly appreciated!!
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Old 07-27-2019, 09:41 AM
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Re: My 1399,300,301,302 Misfire Culprit........

This is an excellent thread, I'm having same issues with EGR system causing misfires at low load after reaching operating temperature. I did clean EGR ports a couple of years ago but never replaced the EGR valve. So I guess I'm going to clean them again.
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