94 LT1 - engine cuts out when using AC
Thread Starter
Heel & Toe
Joined: May 2014
Posts: 15
Likes: 0
From: Pollock Pines CA
94 LT1 - engine cuts out when using AC
Car runs great when temp is less than 210 but when it gets hotter the idle surges up and down 1500-800 rpm. If AC is on and engine is hot (+210) engine cuts out / stumbles. When AC is then turned off - and temp drops below 210 the car runs normal - no cutting out. So, is there some connection between the AC and ignition timing?
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
Car runs great when temp is less than 210 but when it gets hotter the idle surges up and down 1500-800 rpm. If AC is on and engine is hot (+210) engine cuts out / stumbles. When AC is then turned off - and temp drops below 210 the car runs normal - no cutting out. So, is there some connection between the AC and ignition timing?
My wife's car (91 ZR-1) would often stall when rolling to a stop with the AC on. In that case, the Throttle Position Sensor (TPS) was in need of adjustment/re-cal. Once that was done, it ran w/o further stalling (for what it's worth!).
You'd want to scan it as a first step to be sure everything is in spec. Then also take a look at fuel pressure; see what it is doing.
Including the year would also help a lot.
Last edited by Paul Workman; Apr 1, 2018 at 06:27 AM.
Thread Starter
Heel & Toe
Joined: May 2014
Posts: 15
Likes: 0
From: Pollock Pines CA
94 lt1 -
A scanner would be my first choice: seeing whats-what first and go from there.
My wife's car (91 ZR-1) would often stall when rolling to a stop with the AC on. In that case, the Throttle Position Sensor (TPS) was in need of adjustment/re-cal. Once that was done, it ran w/o further stalling (for what it's worth!).
You'd want to scan it as a first step to be sure everything is in spec. Then also take a look at fuel pressure; see what it is doing.
Including the year would also help a lot.
My wife's car (91 ZR-1) would often stall when rolling to a stop with the AC on. In that case, the Throttle Position Sensor (TPS) was in need of adjustment/re-cal. Once that was done, it ran w/o further stalling (for what it's worth!).
You'd want to scan it as a first step to be sure everything is in spec. Then also take a look at fuel pressure; see what it is doing.
Including the year would also help a lot.
I already replaced TPS and MAF switches also new fuel filter - but none of those made any difference
