Fixed high idle miss stutter off idle hesitation etc - ZR-1 Net Registry Forums

Curtis · 02-26-2020

So been chasing this problem for months
Cold runs fine until I cut it off and after a heat soaking car goes nuts

High idle
Hunting idle
Check engine lights blinking on and off
Off idle hesitation or stalling
Bucking
Missing
Stuttering
Off throttle miss during decel
Miss or skip when applying gas after coasting in any gear
Gas mileage sucks

So how I figured this out
Luck
pulled into a parking lot hard and miss disappeared so new it was something loose.... so a week or so later went to an auto parts store to check alternator...
When I restarted it idle jumped to 2k and climbed to 3k.
So I tapped the tps with a Allen wrench and instantly it dropped to a perfect stable 750 and cel went off....
Went home set the tps and it was off a hair but after driving the next day when cold same old deal after second start up
So few days later when hot I started playing with tps plug when idle went nuts
and finally got it to stop. Realized the pins in the plug after 30 years of vibration had flatted out and are loosing connection. The pins should be bulging in the middle...the way mine is routed wires bend 90 to drivers side for an inch or so then down then a 45 under intake so every movement cause the lever arm to pull at wires.

So I de-pinned plug spread open all 3 and reinstalled and after like 4 times got all 3 wires to make full tight contact and not unpin themselves after that folded wires over to plug and zip tied to eliminate this from happening again or wires having any vibration....

So hope this helps....

02-26-2020	#1
Curtis Join Date: Jan 2020 Location: Clarksville,TN Posts: 34	Fixed high idle miss stutter off idle hesitation etc So been chasing this problem for months Cold runs fine until I cut it off and after a heat soaking car goes nuts High idle Hunting idle Check engine lights blinking on and off Off idle hesitation or stalling Bucking Missing Stuttering Off throttle miss during decel Miss or skip when applying gas after coasting in any gear Gas mileage sucks So how I figured this out Luck pulled into a parking lot hard and miss disappeared so new it was something loose.... so a week or so later went to an auto parts store to check alternator... When I restarted it idle jumped to 2k and climbed to 3k. So I tapped the tps with a Allen wrench and instantly it dropped to a perfect stable 750 and cel went off.... Went home set the tps and it was off a hair but after driving the next day when cold same old deal after second start up So few days later when hot I started playing with tps plug when idle went nuts and finally got it to stop. Realized the pins in the plug after 30 years of vibration had flatted out and are loosing connection. The pins should be bulging in the middle...the way mine is routed wires bend 90 to drivers side for an inch or so then down then a 45 under intake so every movement cause the lever arm to pull at wires. So I de-pinned plug spread open all 3 and reinstalled and after like 4 times got all 3 wires to make full tight contact and not unpin themselves after that folded wires over to plug and zip tied to eliminate this from happening again or wires having any vibration.... So hope this helps....