Car shuts off

[madman8664]

I have a 96 GMC truck and I will be driving and all of the sudden the car flickers by that I mean that it just losses all power for a second. I have checked battery connections I replaced fuel filter, plugs and I did have a short with the AC but I replaced the blower control and it fixed it.

[ChevyTech007]

What engine do you have?

[willlgord]

sounds a lot like the problem I had. This is from my last post

 

I found the problem!! Originally I was pretty sure I had a fuel problem so I replaced the fuel pump, filter and pump relay... didn't change a thing. After talking to a shop and showing them the problem I decided it was an ignition problem after which I replaced the coil, plugs and plug wires (I had already put a new cap and rotor in). The truck ran great for a few days then it started stumbling again. It got worse and worse until I noticed it happened mostly after I had hit a bump in the road. My next suspected area was the ignition switch but pounding on the steering wheel to shake the switch didn't do anything so I knew there had to be a bad electrical connection someplace. I probed around under the hood and found that a bundle of wires routed from the top of the engine on the passengers side front had come loose of its clip and was touching the exhaust manifold at the front of the engine. The heat had melted away the insulation (even though the wires were wrapped in some heat resistant tape) and the wires were grounding out now and then (from hitting bumps....speeding up...slowing down). I looked at a friends 99 Tahoe and his clip had let loose also and his wires were pretty close to the manifold too so I'm wondering if this is a common problem. driving.gif

Bill

 

P.S. I figure the reason the truck ran better for a few days after putting the coil, plugs and plug wires in was probably from moving the wires around while working on the truck and they took a while to settle back onto the manifold again.