Help Please! 90 LE Tries but no start. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-05-2005, 12:41 PM   #11
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Whats fuel pressure are you getting at the rail?

Also would you happen to have another ECM you could test with?

Any H body with a 3800 88-91 should have the exact same ECM... After 400 Rpms the ECM should take over, if not, it won't run but for a brief couple of seconds if that...

But knowing the fuel pressure will help...

Also is the nuber 1 injector still leaking or is it now doing the same as the rest?

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Old 12-08-2005, 01:55 PM   #12
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If you found the balancer hub broken, are you shure it didn't damage the CPS?
Doing the injector signal test will verify proper CPS signal.
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Old 12-11-2005, 01:12 PM   #13
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Default RE: No start

I installed a new ECM today. Still tries to start but won't. I will try the light bulb trick on the injector connections today. I did not see any marks on the CPS when I looked at it with magnifying glass while I had the balancer off. What about the cam position sensor? I recall when working at Pontiac dealership replaceing missing magnet in cam gear on one car but if memory serves, it would not fire at all.
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Old 12-11-2005, 02:38 PM   #14
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Default Re: RE: No start

Quote:
Originally Posted by mstopkey
I installed a new ECM today. Still tries to start but won't. I will try the light bulb trick on the injector connections today. I did not see any marks on the CPS when I looked at it with magnifying glass while I had the balancer off. What about the cam position sensor? I recall when working at Pontiac dealership replaceing missing magnet in cam gear on one car but if memory serves, it would not fire at all.
It will fire without the Cam sensor or Interupter, The cam sensor is for the SFI, its used as a fuel reference pulse, for Cyl #1 TDC... Without the cam sensor or interupter it will not be able to run in SFI mode and will reduce performance and effiency..

If the cam sensor were to fail or the Interupter were to jump out leaving the ECM with a loss of cam position signal, the car will still start and run as the ECM will use the last known good Cam Sensor reference... If the battery is dissconnected( ECM will loose its memory ) the car may not run, or if it does it may be crappy..

And have you checked the fuel pressure as of yet? 37-41 Psi would be the general range for the Vin C engines...

If you have Fire, which it seems that you do, It may be time to check the fuel pressure...

Do the before mentioned Injector pluse test with the bulb and see what you get...

Let us know what you find



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Old 12-16-2005, 12:12 PM   #15
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Don't know if I'm too late to be of any help but.....since you believe it is a lean problem...

Could a faulty coolant temperature sensor be telling the computer that the engine is warm when it is not, and therefore not provide sufficient fuel?

Just a thought. There are tables somewhere that give resistance-temperature values for the intake air sensor and the coolant temperature sensor. These should be within 5 degrees of each other, I think. If you have a scan tool, you can read the temps right off it.
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Old 12-17-2005, 11:48 AM   #16
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don't know if you mentioned it but also try removing the ICM plug connector, clean ond tighten up on the sockets. Put it on and off a couple times then apply dielectric grease to the connectors.
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Old 12-21-2005, 10:55 PM   #17
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Default RE: No start

Ok. Goint to work on it some more this weekend. My Monte SS lost oil pressure so now I have to get the Bonne running. I have cleaned the ICM connector and checked the pins. One thought, the faulty coil pack was cracked on the botton and arcing to the ICM mount. The ICM (Sealant?) has melted somewhat and ran down the sides.
Let'* go over what has been done and the current symptoms.
1: The car sat for a year with no fuel. The owner added fuel and went to move it and it would not start, gave it to me.
2: I checked it and found NO fuel pressure, replaced the pump and sock. Filter had been recently replaced. Also checked fuel lines while I had the tank out. Results, no start and would only pop in the intake every once in a while when cranking.
3: Surmised incorrect ignition timing. Found broken hub on balancer and sheared key. Replaced them. Looked at CPS with magnifying glass, saw now marks on it from broken balancer. Results, same as before.
4: Found cracked coil pack arcing to ground. Replaced it. Results, now attempts to start. RPM'* go to about 600 to 800 while trying to start. No longer pops in intake. Just wont won't complete start cycle. If I open the throttle any amount while cranking, it no longer tries to start. Had my son crank while I choked it slightly at the T/B, made no difference. Plugged vacuum accessories to check if it was gatting too much air from vacuum leak, no dice.
5: Took a chance and bought reman'ed ECU. Same symptoms.
I am going to do the light bulb test on the injectors this weekend and F/P test if I can find a gauge.

Thanks for the help. I really need it right now as money is exceptionally tight until Febuary and getting this car going is top priority.
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Old 12-21-2005, 11:24 PM   #18
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Default Re: RE: No start

Quote:
Originally Posted by mstopkey
1: The car sat for a year with no fuel. The owner added fuel and went to move it and it would not start, gave it to me.
.
This could be the problem (or part of it). A year is long enough for gasoline residue to form varnish in the injectors and cut off or minimize the flow of fuel. I saw a post where willwren talked about pulling the fuel rail up with the injectors connected and wired and placing a large pan underneath, then cranking to see what you get. You see flow and pattern for each injector that way.

I'll check to see if you need more info.
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Old 12-22-2005, 12:25 AM   #19
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I think we're on the right track here. Sat for too long with no fuel, old car.....bad fuel and more may be the issue. I'd like to see you remove the fuel rail, then remove the FPR from it. Soak all 6 injectors overnight in injector cleaner, and flush out the fuel rail thoroughly with gasoline (you're going to smell GREAT). Gently disassemble the FPR as well and do the same. I suspect debris in the rail or too much moisture. Everything else says FIRE.

When you soak the injectors, make sure they're upside-down.
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Old 12-22-2005, 01:58 AM   #20
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Default No start

I'll start the injectors, FPR and rail soak tonight so that Saturday they should be good and clean.
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