Engine starts up and dies

[Baldwin]

I have a 2000 VX. Recently engine started to act up more. I would start it up and it would startup and die immediately. Once as I was driving on the highway, the engine just turn off and I had to coast to the side of the road and start it up again. It was happening very infrequent so every time I talked to a mechanic or Isuzu rep, they told me they can't figure it out unless it happens all the time. I'm glad they were all honest and didn't take my money, but it's been happening more often now (though still not every time). Doesn't matter if it's hot, cold, rainy, nice weather, driven daily, sitting for a week. Sometimes I have to keep my foot on the gas ever so slightly to keep the RPM's up so I can drive so that it doesn't stall at a stop light. Most of the time it's ok after driving for a while. Every once in a while it doesn't get back to normal until I park the car, take the key out pump the gas once or twice, and start up again. Then it's fine. Sometimes when I start up, the RPM's will be high above 2300 RPM's and stay high which is opposite of starting up and dieing immediately. I even called into a couple radio car shows and they couldn't figure it out. It started about 3 yrs ago. Only happened once that year so thought it was a fluke. Then it happened again 2 times in one day about a year later. Then nothing for another few months. Then maybe once every 2 months. In the last 3 months, it's happened about 5 times.

[ibmx2]

Check the air hose behind the air filter to see if its lose
If it is doing it under load this maybe the culprit
Load = enough space to let the mass air sensor to drop
Unloaded = slips back into place and starts to run again
Had this happen to one of my cars once
But I would describe it as feeling like bucking when it cut in and out

[Marlin]

It almost sounds like an electrical gremlin.
Things to check:
Fuel pressure regulator(yes I know its not electrical), fuel pump harness, fuel filter, spark plug wires!! I had old wires in a bronco that would randomly shut off. Replaced plugs and wires, problem solved.
Not sure how many miles or what maintenance you have done.

[nfpgasmask]

My 1st guess is FPR as well.

Bart

[etlsport]

i had a similar issue about a year after i got my vx. replacing the fuel filter and fuel pressure regulator completely took care of it. not sure which actually solved the problem, but both of them together was only about 60 in parts and i was able to do installation myself

[Ebenezr]

Fuel filter.

[Mile High VX]

I had this issue with my '69 Z28.

Long story short the connection for the tach had worn at the firewall and every once in a while it would short out. I found it by a fluke and once I fixed it no more issues.

Just a thought.

[MSHardeman]

What MileHigh said. I would definitely replace the fuel filter (and possibly pressure regulator) as they are cheap and easy to do, but this has happened to a couple of people on the site and they found out that it was one of the wire looms passing through the firewall (I think) that had been worn through and was shorting out.

[Ldub]

It almost sounds like an electrical gremlin.
Things to check:
spark plug wires!! I had old wires in a bronco that would randomly shut off. Replaced plugs and wires, problem solved.

When the HELL did we get spark plug wires?

And WHY wasn't I notified???......

[VXIRONwoMAN]

Mine was doing the same thing. Took it to the Mechanic multiple times without ever solving the problem. I finally had him check it out one last time, he found gunk in the throttle body, cleaned it out and the problem was resolved. Now Gill's is doing the same thing. We have yet to take it in, but will keep you posted.

[Marlin]

Mine was doing the same thing. Took it to the Mechanic multiple times without ever solving the problem. I finally had him check it out one last time, he found gunk in the throttle body, cleaned it out and the problem was resolved. Now Gill's is doing the same thing. We have yet to take it in, but will keep you posted.

Touche old man....check the coil packs and associated wiring Maybe take em off, clean em up...

[Dmitrikr]

I would check Idle control valve and throttle position sensor. at least on GM cars - Idle control valve gets dirty, gets stuck open/close- either idles high or stalls at traffic light. Throttle position sensor - wear at one spot - poor signal to ecu - ecu cuts off fuel...

[Ldub]

Touche old man....check the coil packs and associated wiring Maybe take em off, clean em up...

Good GOD man, first we have plug wires, then you mistake my little sister for an old man?...

Check the condom you store your wine in for botulism...SOON!...

[Marlin]

Good GOD man, first we have plug wires, then you mistake my little sister for an old man?...

Check the condom you store your wine in for botulism...SOON!...

*sigh*, wrong post quoted, score 2 for Ldub

[VXSetter]

I am recently having the exact same issues as Baldwin describes here. I was wondering if you ever figured out or resolved this issue. Any guidance or additional info is greatly appreciated.