89 vette misfires when coolant temp goes above 160'f, any help?
10-27-2019, 05:26 AM
#1
89 vette misfires when coolant temp goes above 160'f, any help?
Hi, my 89 vette misfires when it reaches above 160'f +, it does it randomnly but it always does it, if i turn off the engine and restart it it works fine then after a few seconds it starts misfiring again. When it misfires the fuel pressure drops and if i give it a bit of throttle it jumps between 10-50 psi erratically, i was going to change the fuel pump but when its cold it works just fine, 40psi at idle and 47psi with load.
Anyone have any tips what should i check?
Anyone have any tips what should i check?
10-27-2019, 10:48 AM
#2
Safety Car
I had some problems with mine when I got it, ran OK till about 165 degrees when cold out then would buck and barely run. Apparently was the IAC valve. Worth checking.
Do you get a SES light? I would but wouldn't get a code set so it was a pain to try and figure out.
Do you get a SES light? I would but wouldn't get a code set so it was a pain to try and figure out.
Last edited by hcbph; 10-27-2019 at 10:49 AM.
10-27-2019, 11:04 AM
#3
No codes unfortunately