Idle/Tech Question

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Alright- my Sister in Laws' 1997 Isuzu Rodeo 5SP V6 is not idling at all. When I started it, the engine wouldn't catch unless I pumped the gas peadal a few times while turning the key. When the gas peadal is released, the revs just drop back down to 0, until the car eventually stalls. So, being a manual, it was a pain in the 🤬 to get back home because I had to use the combination of engine brakeing and the hand brake to get the truck to stop. There are no "check engine" lights on, and the oil and battery were just changed. I think there is a loose vacuum hose or something, but I havent been able to check that as of yet. Has anyone had a similar problem/ know what is going on?

Thanks
-Tim
 
sounds like a good place to start. and I guess this would be the same basic idea, but have you checked the intake system for cracks and whatnot..
 
getting an auto home like that is pretty fun as well, lol. evertime you come to a slow corner, stopsign or light, you look like the new driver stalling whenever you stop :eek: :) (or hold gas and brake) I don't know Isuzu's, but can you get a key or somthing to make the computer throw codes to the dash or whatnot. I can't get a key for my car, but I found a site on the internet that explained how to do it without the need of one. Good luck!
 
It could be something as simple as the idle screw has slipped to too low an engine speed for the engine to maintain...
 
It could be a cracked vacuum hose. My dad was working on a 929 and we drove it and we came to a stop and the engine would die. We looked under the hood to find that the hose had a ton of duck tape on it, and was still cracked. The guy tryied to fix it himself, but he had no clue as to what he was doing.

It could be a fuel pump too. Or even a clogged fuel filter, not allowing enough gas to get through to keep the engine going.

That's about it, you should check that stuff.
 
masonholmes- I am pretty shure a computer code wouldn't help, as the check engine light is not on, and it is running pefectly except for that.

deathhawk- i am not shure it is carberated or not, as I havent had a good look at the engine yet, and I dont recall fuel lines going into the intake system.

GilesGuthrie- good point- but when I parked it it was idling perfectly, so I dont think that would be it, unless someone messed with the car while I was gone....

MazKid- Cracked vacuum hose was my first guess, and I am hoping that is all that it is, and I hope it isnt too expensive if it the hose.

Thanks guys for all your help, and i wont get a chance to inspect the car until monday afternoon, and i'll tell you what happens.

-Tim
 
If you got it started by pressing on the gas, it is a carburated engine. Doing that to EFI floods the engine.
 
ahh ha, but the injector/s could be failing or just acting up. I had to do this after my first GS set at a body shop for a fwe days. Scared the stuff outta me, but it never did it again. Still, I had to pump it like amother, and she shook and rattled for abouta minute. Was perfect from then on. As for computer codes and no CEL, I guess you're right, although I've seen cars throw codes even when the light isn't on.. Good luck!
 
I guess it was the injectors acting up, because when I started it today it ran perfectly, like nothing had happened. Thanks for all the suggestions, and by the way, Buick GS 455 Stage 1 convertable is my dream car :)
 
Cool man, good to hear! Hope you never have the prob again. It's like you were to have run it completely out of gas and all the fuel had drained etc. (although this wasn't the case, so I'm not implying anything)
later yo!
 
Here's an item to check depending on your mileage. The fuel filter may be the problem. During idle the fuel pump cannot push enough gas past a partially clogged fuel filter. As the vehicle is driven it will run fine as the fuel pump creates more pressure to supply the engine. It may start fine after sitting for a few days if the bloakage moves but may come back again after being driven for a while.

Another item to check is the vacuum line that is connected to the diaphrapgm for the warm air intake. I had a Mazda pickup that would stall and chug really bad at idle and run fine when driven. The vacuum line on the intake trumpt for the aircleaner that controls the air flow had come off and closed off the intake trumpet just like it does when the engine is cold started. The intake pressure was enough to force the valve open during driving but was not enough at idle.
 
The last carbureted passenger vehicle sold in America was the 1995 Isuzu Pickup - this vehicle is fuel injected.
 
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