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post #1 of (permalink) Old 11-03-2002, 06:35 PM
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sick baby (88 Blazer)

My truck refuses to run or start when needed.When it does start it won't idle without throttle help while cold( it used to).It has headers with out cats.Distributor cap and rotor button fairly new.The engine trouble code only tells me to check the cooling system. Engine temp is normal 200. In traffic the other day it began to rev-up by itself while sitting at red light. I had to stand on the brakes (no fun)When light went green it lurched and went dead. Had a nice ride home in the rollback.I know nothing about the ECM.I have my wallet out... what do you think?
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post #2 of (permalink) Old 11-03-2002, 08:24 PM
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Re: sick baby (88 Blazer)

Look for a big vacuum leak.

Check the alternator - a bad alternator causes the ECM to go nuts.

Disconnect the battery, leave it disconnected at least 1/2 hour
to clear the long term memory, then try again.
The short 3 minute disconnect only clears codes, not memory.

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post #3 of (permalink) Old 11-03-2002, 08:55 PM
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Re: sick baby (88 Blazer)

Look for a vacuum leak as suggested.

However, myself being the lazy POS I am, I'd look at the EGR valve first. Spark up your Blazer and make like a monkey and lay over the passenger fender. Stuff your pinky finger up the bottom side of the EGR valve and press up. Girly fingers aren't going to hack it. When an EGR valve opens at idle it's like one big-assed vacuum leak and the motor will piss and moan until you close it and the computer will try to compensate. If, while pushing up (and it's not easy, my cousin couldn't do it and he's a master mechanic grease monkey) there is no change then it's probably the EGR valve. Two bolts, twenty minutes, and a lot of cursing and you'll have it off. Once you get it off you can blow through it and see if it leaks.
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