Hey Gang,
I need some help. My wife's car is a 95 Voyager /w 3L mit. engine in it and about 215,000 mile on the van. Back in Aug. I had a local shop put a timing belt, water pump and new cam and crank seals on. I would have done the job, but it had been too hot and too wet, as I have to work in the drive way.
Got the van back, and it ran great, no oil leaks plenty of pickup, etc.
A couple of weeks later my wife said it was surging and stalling when she stopped at a traffic light or stop sign. It will refire right away, not problems.
No problem I said, I just need to clean the throttle body. So I pulled the throttle body and the idle speed controler, and cleaned with throttle body cleaner. But that didn't change a thing. Still surging and stalling.
So now for a little more info:
1. The fuel filter has less than 8K mi. on it.
2. I drove it to a buddy's last weekend to work on it. When I stopped, I put my left foot on the brake, and gave it just a touch more throttle, and the surging stopped.
My wife usually puts it in neutral at the lights.
3. When we were working on it, I didn't like the idea of it being in gear, even with the wheels chocked and the emergency brake set. I was affraid that a wild surge might have the van drive into my buddy's garage. So I turned on the headlight (high beam), the heater blower motor, and the AC. This load would cause the engine to surge, but it didn't stall that often.
We could find anthing obviously wrong. The TPS had a steady .7V output. We pulled the TPS and slowly swept it through it's full range, and the resistance seemed to increase smoothly as we went. The throttle body was clean. The Idle Speed Controler was working fine. But if you put your finger of the port in the throttle body, it would idle down to about 500rpm (base idle), but still surge. The EGR
seemed to be working correctly.
The only thing we noticed was the purge valve was cycling constantly. Don't know if that is normal.
Never really noticed it before. So we replaced the rubber hose that connects the purge valve to the
manifold. No change.
We cleaned the both connections to the battery and the ground where it attaches to the block (battery side of the front head,) and to the chassis (below the PCM).
I get no codes, except those that I have induced by pulling the connector for the evap system and the TPS. Disconnected the battery, those codes went away, and never reappeared.
I can start just throwing parts at this, but before I do, anyone have any sound ideas of what else to check or try?
TIA
John
I need some help. My wife's car is a 95 Voyager /w 3L mit. engine in it and about 215,000 mile on the van. Back in Aug. I had a local shop put a timing belt, water pump and new cam and crank seals on. I would have done the job, but it had been too hot and too wet, as I have to work in the drive way.
Got the van back, and it ran great, no oil leaks plenty of pickup, etc.
A couple of weeks later my wife said it was surging and stalling when she stopped at a traffic light or stop sign. It will refire right away, not problems.
No problem I said, I just need to clean the throttle body. So I pulled the throttle body and the idle speed controler, and cleaned with throttle body cleaner. But that didn't change a thing. Still surging and stalling.
So now for a little more info:
1. The fuel filter has less than 8K mi. on it.
2. I drove it to a buddy's last weekend to work on it. When I stopped, I put my left foot on the brake, and gave it just a touch more throttle, and the surging stopped.
My wife usually puts it in neutral at the lights.
3. When we were working on it, I didn't like the idea of it being in gear, even with the wheels chocked and the emergency brake set. I was affraid that a wild surge might have the van drive into my buddy's garage. So I turned on the headlight (high beam), the heater blower motor, and the AC. This load would cause the engine to surge, but it didn't stall that often.
We could find anthing obviously wrong. The TPS had a steady .7V output. We pulled the TPS and slowly swept it through it's full range, and the resistance seemed to increase smoothly as we went. The throttle body was clean. The Idle Speed Controler was working fine. But if you put your finger of the port in the throttle body, it would idle down to about 500rpm (base idle), but still surge. The EGR
seemed to be working correctly.
The only thing we noticed was the purge valve was cycling constantly. Don't know if that is normal.
Never really noticed it before. So we replaced the rubber hose that connects the purge valve to the
manifold. No change.
We cleaned the both connections to the battery and the ground where it attaches to the block (battery side of the front head,) and to the chassis (below the PCM).
I get no codes, except those that I have induced by pulling the connector for the evap system and the TPS. Disconnected the battery, those codes went away, and never reappeared.
I can start just throwing parts at this, but before I do, anyone have any sound ideas of what else to check or try?
TIA
John
