Cranks but won't start - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-21-2005, 12:20 PM   #1
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Default Cranks but won't start

When it'* below freezing out, my car will crank but won't start.
If I tap the gas a little, it will start.
And when it'* warm it starts right up.
I've tried switching IAC valves, cleaning the passage, and I even switched back to my original 95 L36 TB with the same results.
Any other ideas?
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Old 12-21-2005, 12:20 PM   #2
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have u checked the Fuel Press?
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Old 12-21-2005, 12:34 PM   #3
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Knowing you've done a good amount of work to the motor. Has the TPS ever been off? I know there is the possiblitly to put one on almost right. Pure guess though.
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Old 12-21-2005, 12:55 PM   #4
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I haven't checked the fuel pressure lately. I'll have to remember to do that when I get home.
The TPS hasn't been taken off the TB I just put on so that should be good.
Keep em comming guys.
PCV valve?
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Old 12-21-2005, 12:56 PM   #5
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I have an idea for you. Let'* find out if it'* too rich or too lean. If you have your MAF screen installed, put duct tape on it to cover about 1/3 of the surface area and see if that helps you start.

If so, you may have a lean start condition to track down. The Zilla has a mild case of this due to all the porting I did. If I cover part of the screen, she starts right up on a cold morning.
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Old 12-21-2005, 12:58 PM   #6
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Quote:
Originally Posted by 95naSTA
I haven't checked the fuel pressure lately. I'll have to remember to do that when I get home.
The TPS hasn't been taken off the TB I just put on so that should be good.
Keep em comming guys.
PCV valve?
thats just pressure in the crankcase if it isnt working right? that wouldnt cause it not to fire right? First I would check the fuel filter.
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Old 12-21-2005, 01:03 PM   #7
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Yeah I guess not on the pcv.
Bill, I don't have the screen installed. If I tried to richen it up via afc, that should work too right?
On a side note, My IAC valve is 500% louder on my 95 TB.
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Old 12-21-2005, 01:08 PM   #8
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Quote:
Originally Posted by 95naSTA
Yeah I guess not on the pcv.
Bill, I don't have the screen installed. If I tried to richen it up via afc, that should work too right?
On a side note, My IAC valve is 500% louder on my 95 TB.
The AFC would only help if you were ACTUALLY getting fuel. That'* why I suggest restricting air first. Get that screen in and try it.

If it works after you restrict the intake on start, your possible suspects are:

IAC (open too full or stuck open) or associated wiring if both do the same
Vacuum leak <-------- biggie here
FPR/Fuel pump/Filter

There are others, but not as likely.
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Old 12-21-2005, 09:45 PM   #9
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Quote:
Originally Posted by willwren
Quote:
Originally Posted by 95naSTA
Yeah I guess not on the pcv.
Bill, I don't have the screen installed. If I tried to richen it up via afc, that should work too right?
On a side note, My IAC valve is 500% louder on my 95 TB.
The AFC would only help if you were ACTUALLY getting fuel. That'* why I suggest restricting air first. Get that screen in and try it.

If it works after you restrict the intake on start, your possible suspects are:

IAC (open too full or stuck open) or associated wiring if both do the same
Vacuum leak <-------- biggie here
FPR/Fuel pump/Filter

There are others, but not as likely.
Bill, I know you said try the duct tape and screen thing first but it will take a while before I have time to test that out. I mean this weekend I can wake up and try it but during the week I go to work in the morning.
Soo, When I was leaving work I figured I'd just try it out. The car started no problem. I'm taking this with a grain of salt though since it'* an intermittent problem.
But I looked at my fuel trims and they were way lean.. I adjusted the afc accordingly.
Tomorrow morning I guess I'll see if that fixed the problem.
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Old 12-22-2005, 11:13 AM   #10
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My car started no problem today.
Needless to say I was grinning ear to ear the whole way to work.
So, now my lt fuel trims are tamed back to 128-9ish, I have my evap canister hooked up with my old TB, and I don't practically have to flood the engine to start it.
I can't wait to see what this does to my gas mileage.
Not to mention my trans has given me zero trouble in the past 3 weeks. (Haven't floored it in months. )
This is great.

Edit - Thanks guys!
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