L98 hesitates when cold...
Thread Starter
Racer
Joined: Nov 2002
Posts: 471
Likes: 0
From: Queens NY
Re: L98 hesitates when cold... (JCAIRE2)
well, yeah
but none of my f-bodies ever did that when id start them up first thing in the morning..
basically right after i start it up, if i give it half throttle it stalls
but none of my f-bodies ever did that when id start them up first thing in the morning..
basically right after i start it up, if i give it half throttle it stalls
Thread Starter
Racer
Joined: Nov 2002
Posts: 471
Likes: 0
From: Queens NY
Re: L98 hesitates when cold... (JCAIRE2)
idle quality is decent but just a bit off, almost like the cam might be going
youre right, it never liked scanners much, but interestingly enough the scanner works if i leave a wire jumping the A and B pins and put the scanner plug in OVER the wire
youre right, it never liked scanners much, but interestingly enough the scanner works if i leave a wire jumping the A and B pins and put the scanner plug in OVER the wire
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
Re: L98 hesitates when cold... (CarAteMyMoney)
idle quality is decent but just a bit off, almost like the cam might be going
youre right, it never liked scanners much, but interestingly enough the scanner works if i leave a wire jumping the A and B pins and put the scanner plug in OVER the wire
youre right, it never liked scanners much, but interestingly enough the scanner works if i leave a wire jumping the A and B pins and put the scanner plug in OVER the wire
So it only does this when cold, not after warm-up. Can you use the scanner to confirm the engine parameters are within bounds? Maybe try unplugging the cold start injector, see if that helps with the cold stumble. It can only be one of 3 thrings as we know, fuel, spark or air. I'd venture a guess that the cold start is dumping too much fuel in and bogging the engine. Just a guess though.
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Safety Car
Joined: Jul 2003
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From: Saratoga Springs NY
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Re: L98 hesitates when cold... (CarAteMyMoney)
I would start the car cold, with a timing light hooked up.Watch the timing stay fixed as you rev the motor up..Keep doing this and see how long it takes before the timing advances when you rev the motor-this is now outta cold operation and is ready to go..Sometimes they stay in cold mode too long due to thermos,w/p , etc..You could definatly have a thermosensor going bad telling the computer to stay in warmup too long.Never trust the computer.
Its also quick easy and almost free to do, but i would remove and FULLY clean the throttle body.If your still wanting to go further,unplug the cold start injector and see how it acts..At this point also another free (but pain in the ****) is to remove,torch with propane,and reinstall the o2 sensors.DONT use ANY chemicals on it, just heat it up till it almost glows(like 10secs) at a time, then wipe off with a clean rag..Youd be suprised the difference..
Hope this helps---Brian
Its also quick easy and almost free to do, but i would remove and FULLY clean the throttle body.If your still wanting to go further,unplug the cold start injector and see how it acts..At this point also another free (but pain in the ****) is to remove,torch with propane,and reinstall the o2 sensors.DONT use ANY chemicals on it, just heat it up till it almost glows(like 10secs) at a time, then wipe off with a clean rag..Youd be suprised the difference..
Hope this helps---Brian
