96 cuts out while driving
Drifting
Joined: Aug 2006
Posts: 1,326
Likes: 18
From: Los Angeles California
I had this happen when my coolant temp sensor's connector melted against the water pump. When watching the coolant temp readout, the number would go crazy every time the car bucked. The car was rapidly switching its hypothesis from "engine temp is below freezing" to "engine temp is warmed up". One of the few problems the car had that I wasn't the root cause of.
This is hardly likely though, there's a thousand things to be ruled out using various measurements.
This is hardly likely though, there's a thousand things to be ruled out using various measurements.
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
When warm, will it start right back up after shut down?
When symptom present, does it idle? Smooth? Rough?
Thread Starter
6th Gear
Joined: Apr 2013
Posts: 6
Likes: 0
Yes it's cold starts fine and runs smooth as glass idle or otherwise, it does sound like the battery is weal tho, especially after warmed up
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
Also, when warm, does it restart smooth?
Does it only misfire while moving at speed?
Is the misfire more upon accleration, or when you give it gas?
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
Icm?
Might it be the ICM (Ignition Control (Coil) module)?
Likely the ICM is screwed to a heat sink which is bolted to the passenger side head front side.
If loose and/or the heat sink paste has degraded or the ICM has gone bad, it might produce the symptome your getting.
FYI, Autozone has a tester for the ICMs.
On our 94, it just 'went', and the car wouldn't start, but after installing a new one, performance was improved and a 2k rpm hessistation went away.
BTW, only use ACDelco, have read others having problems with other brands. Radio shack sells heat sink paste which MUST be used (NOT the same as 'dielectric grease').
Likely the ICM is screwed to a heat sink which is bolted to the passenger side head front side.
If loose and/or the heat sink paste has degraded or the ICM has gone bad, it might produce the symptome your getting.
FYI, Autozone has a tester for the ICMs.
On our 94, it just 'went', and the car wouldn't start, but after installing a new one, performance was improved and a 2k rpm hessistation went away.
BTW, only use ACDelco, have read others having problems with other brands. Radio shack sells heat sink paste which MUST be used (NOT the same as 'dielectric grease').
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
I'm thinking ICM as well.
However, I had a some instances of this behavior for about a month or so prior to my fuel pump going out completely. This after replacing coil and icm. But mine would be more random events. No issues since the new pump went in.
But yes, first instinct tells me ICM.
However, I had a some instances of this behavior for about a month or so prior to my fuel pump going out completely. This after replacing coil and icm. But mine would be more random events. No issues since the new pump went in.
But yes, first instinct tells me ICM.
