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Username Post: 1989 c2500 5.7 Tbi        (Topic#367922)
Leoaravanis 
Newbie
Posts: 1

Reg: 03-13-22
03-13-22 04:02 PM - Post#2838078    

I’m stumped,1989 gmc 350 tbi ,starts like a champ runs good at warm up then slowly after close loop engine start to miss rich.list of things are new ,IAC,New Temperature coolant sensor,new wires ,plugs performance distributor shaft complete,tps,egr,map,egr soleniod.problem gradually over winter if I disconnect coolant sensor will run great.otherwise after heating up almost stumbling at stop and idle.ran great over summer ,02 sensor good oscillating within range.my neighbors Same here 3500 does the same thing he has to disconnect the sensor to drive.any help is great my friends.thanks.



Edited by Leoaravanis on 03-14-22 05:15 AM. Reason for edit: No reason given.

 
CowboyTrukr 
"11th Year" Silver Supporting Member
Posts: 4782
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
03-13-22 11:55 PM - Post#2838088    
    In response to Leoaravanis

Howdy and welcome, Leo.

Here’s a set of instructions on how to check the temp sensor.
https://www.chevytalk.org/fusionbb/showtopic.php?t...

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

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


 
Tony1963 
Frequent Contributor
Posts: 1286

Loc: Orlando Florida
Reg: 07-09-18
03-14-22 07:10 AM - Post#2838098    
    In response to Leoaravanis

I've said this before and I'll say it again. Get a scan tool for a vehicle from that era. An old Snap On MT2500 brick scanner is pretty cheap and can read ALL, I repeat, ALL of the data points on that system. Without reading the data, you are guessing.

Changing parts is a waste of time, money and sanity if you don't have a diagnosis.



Edited by Tony1963 on 03-14-22 07:11 AM. Reason for edit: No reason given.

 
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