1996 isuzu CPU Problem?
polock62
05-26-2006, 08:39 PM
Ladies and Gentleman I have exhausted all ideas.
1996 Isuzu Rodeo 3.2 V6
Check this out. About 3 months ago, I was fixing a water leak on my upper intake plennium. Well i accidentilly crossed a water and a vaccum hose causing my number six cylinder to fill up with water, therefor breaking the piston rod. I decided the car was worth fixing. I bought a junkyard motor that had approx 70K on the engine. I used the block from the junkyard and the number 5 piston to replace the number 6 piston i had broken. Other than that I used all my original parts, my pistons my crank, my heads the whole nine yards. I put new rings and bearings into the engine. While i had it apart i did a valve job. After reassembling the whole engine and installing it back into my car I attempted to start the car. The car wouldn't start I had put the timming belt on backwards. It was a complete 180 of what it was supposed to be so luckly i didn't bend any of my valves. Now, i fixed my timming and the car started right up. It idled smoothly. However, I decided to take it for a test drive and the car didn't have any power until i reached 4k RPM, and then it would kicking in like it ran before. I tried to solve the problem several different ways, first i thought i heard a little miss so i replaced the spark plugs, that help tremendously. But didn't fix the problem, i still don't have any power. So next i replaced the fuel regulator, just on a hunch. That didn't fix the problem. (By the way folks its a continues fuel rail). Ok, now i was just unplugging things to see if the car would act any differently. I was able to unplug the number 2,4,6, cylinder coils and the car would still idle smoothly (odly enough). However if i unplugged any of the 1,3,5 cylinder coils the car would just about die. So i figured i might have a bad injector. I replaced the number 2 cylinders injector. This is where it gets wierd. Instead of the 2,4,6 injectors running lean and the 1,3,5 injectors running rich like they did before they have swapped. Now the 1,3,5 injectors run lean, and the 2,4,6 cylinders run rich. Now this tells me at least that all my injectors are working. I decided i would unplug the oxygen sensors and run it on a cold air start system. The car runs pretty good, with only minimal loss of power but no surging at 4k RPM. I ran tests on the throttle posistioning sensor and the MAP sensor and according to the computer they are working correctly.
In conlcusion, I think there is a problem with one of my sensors controlling fuel or vaccum. (I did not put a vaccum gauge on the car but their is vaccum.) Does anyone have any idea? I've exhausted all ideas.
Oh yeah, my lasted idea given to my by a local mechanic was bad oxygen sensors so i replaced all 4 of them! Kinda costly for no difference made.
1996 Isuzu Rodeo 3.2 V6
Check this out. About 3 months ago, I was fixing a water leak on my upper intake plennium. Well i accidentilly crossed a water and a vaccum hose causing my number six cylinder to fill up with water, therefor breaking the piston rod. I decided the car was worth fixing. I bought a junkyard motor that had approx 70K on the engine. I used the block from the junkyard and the number 5 piston to replace the number 6 piston i had broken. Other than that I used all my original parts, my pistons my crank, my heads the whole nine yards. I put new rings and bearings into the engine. While i had it apart i did a valve job. After reassembling the whole engine and installing it back into my car I attempted to start the car. The car wouldn't start I had put the timming belt on backwards. It was a complete 180 of what it was supposed to be so luckly i didn't bend any of my valves. Now, i fixed my timming and the car started right up. It idled smoothly. However, I decided to take it for a test drive and the car didn't have any power until i reached 4k RPM, and then it would kicking in like it ran before. I tried to solve the problem several different ways, first i thought i heard a little miss so i replaced the spark plugs, that help tremendously. But didn't fix the problem, i still don't have any power. So next i replaced the fuel regulator, just on a hunch. That didn't fix the problem. (By the way folks its a continues fuel rail). Ok, now i was just unplugging things to see if the car would act any differently. I was able to unplug the number 2,4,6, cylinder coils and the car would still idle smoothly (odly enough). However if i unplugged any of the 1,3,5 cylinder coils the car would just about die. So i figured i might have a bad injector. I replaced the number 2 cylinders injector. This is where it gets wierd. Instead of the 2,4,6 injectors running lean and the 1,3,5 injectors running rich like they did before they have swapped. Now the 1,3,5 injectors run lean, and the 2,4,6 cylinders run rich. Now this tells me at least that all my injectors are working. I decided i would unplug the oxygen sensors and run it on a cold air start system. The car runs pretty good, with only minimal loss of power but no surging at 4k RPM. I ran tests on the throttle posistioning sensor and the MAP sensor and according to the computer they are working correctly.
In conlcusion, I think there is a problem with one of my sensors controlling fuel or vaccum. (I did not put a vaccum gauge on the car but their is vaccum.) Does anyone have any idea? I've exhausted all ideas.
Oh yeah, my lasted idea given to my by a local mechanic was bad oxygen sensors so i replaced all 4 of them! Kinda costly for no difference made.
Ramblin Fever
05-26-2006, 11:44 PM
Wow! You really DO like that truck, don't you? And I thought I had a lot of time in mine.
How'd the internals of your engine look when you tore it down?
Sorry, I'm not able to help your position, but it's nice to hear of someone who believed their truck was still worth it. I've seen so many trashed Rodeo's in Colorado, it just makes me sad to know of the potential they once had.
How'd the internals of your engine look when you tore it down?
Sorry, I'm not able to help your position, but it's nice to hear of someone who believed their truck was still worth it. I've seen so many trashed Rodeo's in Colorado, it just makes me sad to know of the potential they once had.
polock62
05-27-2006, 11:14 AM
Yeah dude, I love my my rodeo... i just wish i could fix the damn thing. I feel so helpless... all this time and money and not the end result i was looking for. Take it easy bro...
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