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90 Prelude si Crank but wont start All checks are good HELP

 
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Old 04-09-2016, 08:51 PM
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Icon5 90 Prelude si Crank but wont start All checks are good HELP

I have gone through everything I can think of, I have checked my dis, plugs, wires, fuel pump and filter, injectors, igniter, tdc, cyl sensor, air temp, map, main relay is good, tried a know good ecu and still nothing. I am at my whits end and can not figure this out. I have had the car for 7 years putting a lot into it. When I turn the key it just cranks but dosent even try to start. but I have air fuel and spark verified in all 4 cylinders and good compression all the way across.
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Old 04-09-2016, 10:50 PM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

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Originally Posted by cs_90_prelude_si View Post
I have gone through everything I can think of, I have checked my dis, plugs, wires, fuel pump and filter, injectors, igniter, tdc, cyl sensor, air temp, map, main relay is good, tried a know good ecu and still nothing. I am at my whits end and can not figure this out. I have had the car for 7 years putting a lot into it. When I turn the key it just cranks but dosent even try to start. but I have air fuel and spark verified in all 4 cylinders and good compression all the way across.
Do you have compression? An engine needs three things to run...air/fuel mixture, spark, and compression. Have you done a compression test?

You said that you have checked a lot of things, but how did you check them? Not questioning your abilities, but since we know nothing about you we have to start from the beginning.
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Old 04-09-2016, 10:54 PM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

Yes I did a compression test, I had 91 to 93 psi on all cylinders. I cranked it about 5 to 7 times.
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Old 04-10-2016, 02:13 AM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

Those numbers are very low for a 3rd gen, but it should run with that compression. How old is the gas in the tank? Has it been sitting for the 7 years, or have you been driving it most of that time?
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Old 04-10-2016, 02:44 AM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

I just it quit 2 months ago. drove it one day then got in it next morning and it just cranks forever. I have the factory service manual so I will check and post what it says. I have been through my car and motor many of times.
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Old 04-10-2016, 11:17 AM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

Ok I just checked my book you are correct. It should be a min of 135psi to 178psi. I should have caught it. I realized I did compression test with closed throttle, will test again in a few. I will post my results
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Old 04-11-2016, 09:22 AM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

Quote:
Originally Posted by luzer View Post
Do you have compression? An engine needs three things to run...air/fuel mixture, spark, and compression. Have you done a compression test?

You said that you have checked a lot of things, but how did you check them? Not questioning your abilities, but since we know nothing about you we have to start from the beginning.
Engine needs four things to run, the three Luzer mentioned plus they need to all happen at the right time. Get engine at TDC and check timing. If compression will get up to 100 it should at least run.
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Old 04-11-2016, 10:50 AM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

Went back and reread post. Saw where you checked TDC. Sorry.

Ed
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Old 04-11-2016, 09:11 PM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

I'd readjust the valve clearances before the next compression check. 90 psi is a little low.
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Old 04-12-2016, 10:42 AM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

I remember my car had a similar problem when I got my 1st lude I pulled the fuel pump and main relay a and replaced them, BUT the new pump was also not working so a 3rd on finally fixed it, so if it doesn't fire upon crank my guess is its got to be somewhere in the fuel delivery area
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Old 04-12-2016, 07:35 PM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

So I checked my compression again and checked valve adjustment and all was good, test showed approx. 100 psi per cyl. I did recently put on a pk3y head not sure if that lowered my compression. Did a leak down test and all 4 had about 25% leakage. I have two temp sensors on my thermostat housing one that is a normal coolant temp sensor which can be traced on a wiring schem. But I have another one that is a temp sensor but it had gone bad on me once before and kept me from running, any ideas as to what that second coolant temp sensor goes to? No its not the one for my gauge That is the 3rd smaller one on my housing. But I tested the unknown sensor and low and behold its bad again. About to swip the one on my girls 3gen lude that I am also fixing. I have put a new fuel pump on it the other day. Also used main relay in my girls lude and it fired right up. I also know my injectors are pumping fuel and I have fuel pressure.
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Old 04-12-2016, 07:39 PM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

Just did a 3rd compression test and a leak down test. Now I have 100 psi on cylinders 1,3 and 4, and number 2 only had about 25 psi. so I redid a leak down, number 2 had 80% leakage but couldn't hear it in my intake exhaust or oil cap, pulled radiator cap and no bubbles either, my guess I am leaking into another cyl, but all leak test on cylinders 1,3 and 4 were still showing as approx. 25% leakage. I am stumped.
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Old 04-12-2016, 07:42 PM
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Re: 90 Prelude si Crank but wont start All checks are good HELP

So everyone knows I drove my car home from work one day and then it just wouldn't start the next. Just wanted to make sure everyone was clear that I had no warning signs of something failing, car normally runs like a champ(can hang with v-6's on a good day)
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