Junior Member
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Join Date: Feb 2021
Location: Saint-colomban, quebec
Posts: 11
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Junior Member
Join Date: Feb 2021
Location: Saint-colomban, quebec
Posts: 11
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Engine hesitation ***Need help***
Hi everyone,
So I performed a 5 speed swap on my 1999 3.4l. It went fine and the truck ran great for at least a week with the auto ECU. Then I figured the immobiliser on my manual ECU and swapped this one. The truck ran fine for another couple of days then starts to hesitate @ low rev and more than 1/3 of throttle. Runs pretty smooth over 2000rpm. I reswapped the automatic ECU and no luck, stays the same so I dont think the ECU is related.
-I changed my MAF and my TPS with no success.
-I look for a vaccum leak (visual and with propane), no luck.
-No CEL in the dash. If I check the pending codes I have #5missfire (not surprise since the truck jerks at every take off.
-Seems to be running a little smoother when cold
Not sure what to look for now to avoid changing every sensor of the car.
Any path to follow or ideas?
Thanks in advance folks!
Phil
Last edited by Philbo; 03-10-2021 at 02:26 AM.
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