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Username Post: 1994 Full Size Blazer - rear end clunk        (Topic#348590)
Whistling Buford 
Posts: 28

Age: 59
Loc: Philadelphia Area
Reg: 10-16-17
12-07-17 09:56 AM - Post#2717183    

I looked around and could not find a thread on this. My 'new to me' 94 Blazer is coming along well, thanks to a lot of help here on this site.
Two questions :
1. How do I reset (or re learn) the idle. It has a slightly erratic idle when I am at a light with it in drive. Never stalls just seems to 'hunt around' for steady idle. No problem once acceleration starts.
2. When I hit the gas, feels like the rear is rolling around slightly and makes a thud. Again, once going through the power band, no issues.

Edited by Whistling Buford on 12-07-17 01:26 PM. Reason for edit: No reason given.

"7th Year" Silver Supporting Member
Posts: 3968
Loc: Salt Lake City
Reg: 06-20-09
12-08-17 01:53 PM - Post#2717328    
    In response to Whistling Buford

Idle is regulated by the IAC. To reset things, disconnect the battery negative for about a minute. Then, get yourself a paper clip. Form a u shape with the ends about 3/16” apart. Short terminals A&B in the disgnostic port. (Top right and immediately to the left). Turn the key on and let it sit for about 30 seconds. The SES light is going to flash while this is going on. Pay attention to the flash patterns. They come in pairs. One flash, two flashes = 12. Write down any codes that are not 12.

Turn it off and remove the clip. Start it up.

When was the last time you replaced the coolant temp sensor.


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"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke

Whistling Buford 
Posts: 28

Age: 59
Loc: Philadelphia Area
Reg: 10-16-17
12-09-17 05:59 AM - Post#2717380    
    In response to CowboyTrukr

Truck is new to me, so I have not replaced the temp sensor yet.

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