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Isuzu Rodeo No Start Stall Idle Problems



  • There is no power to anything--lights, radio, etc.
  • isuzu rodeo 1995 wont start. Been like this for 10 days till yesterday. Replaced spark plugs, it cranked and ran all day. Today it started then died and wont crank. Fuel pressure is good, fuel pump working. The last few months it sometimes blows black exhaust from the tail pipe and runs a little sluggish when this is happening. We think it is sometimes pumping too much fuel and choking it down like it is flooded. Could it be an O2 Sensor?
  • ivy96ivy96 Posts: 8
    I had the same problem a few months ago and no one could tell me what was wrong. Well, it took a while, but I discovered my IAC motor was shot. It's a small black thing that attaches to your throttle body. It controls the air intake! When I pulled mine out is was black and practically fell apart, lol. This is a $50 part at Kragen and it takes about 10 minutes to fix. If you have a Chilton Guide, look it up and you will see that it's very simple. My 1996 Rodeo has NOT had any problems since I fixed it! And if that doesn't work, check your Mass Air Flow sensor and you ERG valve, but I'm willing to bet it's the IAC, it sounds like you are having the EXACT same problem as I was. Good luck and I sure hope this helps.
  • Thanks so much! I will try that!
  • Havent been able to try yet- it actually cranked today for a short time then died- i smell gas!! Big time!
  • ivy96ivy96 Posts: 8
    YUP! That's what was happening to me. It would run fine for even days at a time, then suddenly die on me at a stop sign or a red light. Check it out this weekend, it could really save you a lot of time and money.
  • thanks for all your help. Got a friend of mine, a mechanic on the way over today to check the IAC motor. Where is it located?? What tools do I need to remove it?
  • ivy96ivy96 Posts: 8
    It's off the throttle body, it has 3 screws that you need to unscrew to get it off, so you'll need a screwdriver. LOL. That's it! Sorry if I'm answering you way late, it's the first time I've logged onto my computer today.
  • Thanks. We got it off and replaced with a new one. However, ist still will not crank. Any ideas on the next step. We think we are going to buy a fuel pressure regulator tommorrow and try that.
  • Fuel filter perhaps? Fuel pressure comes in at 40-42 psi. But despite that could replacing the fuel filter help?
  • maloprmalopr Posts: 14
    have you replaced the IAC (idle air control valve) which is located on the throttle body. If you don't know how this part looks like just ">google in image mood isuzu rodeo idle air control valve.
  • Yes. Replaced the IAC Motor today, and no change. We cleaned the carbon away and put the new one in, but it still wouldnt start. Going to change fuel fitler tommorrow then the O2 sensor. How does that sound?
  • also thinking the crank shaft sensor-
  • ivy96ivy96 Posts: 8
    I'm sorry, I thought for sure it was the IAC. after that, I have no clue where to go from there. But, will you let me know what does work, just in case this comes up with mine again? It's always nice to know where to start looking for the fix. LOL. Good luck to you.
  • Replaced the fuel filter. No change. It cranked for a few sec then quit.
    We put the old IAC motor back on but now when testing it it isnt working. Above the IAC motor on the ERG Valve (i think) are several wires. 2 sets of them and they are disconnected from the connectors. The wires (2 sets) are taped together and not connected to the terminals. Been this way since I bought it and never had a problem. It runs to the vaccum. Not sure if this is related.

    When we spray starter fluid in the intake, it still wont crank. Its not a fuel issue.
    Stuck now- not sure-
  • ivy96ivy96 Posts: 8
    Wow!! Is your Check Engine light on at all? Check your Mass Air Flow sensor, this looks like a square box coming from your air filter, it looks like it's part of the hose itself, but it's not, you'll see hose clamps on either side. Check that, it seems to me that you are having an air intake issue. Also, check all your vacuum hoses and make sure there aren't any holes or rips. Good Luck. I'll look further into it and see if there's anything else that would be causing this problem.
  • Thank you so much for helping. I got a buddy of mine helping thats a mechanic- but we are doing all this from my front yard. I had one mechanic tell me I dont have a mass air flow sensor on this vehicle- something else- i cant remember what it was-

    i think it is air intake also- does crankshaft sensor involve that?? or MAP sensor?

    will re- convene tomorrow!

    Thank you so much!!
  • Check engine light is not on. occasioanally when i would drive it would come on- very rare- black smoke from the tail pipe- seemed to run a little rough- but then minutes later- it was fine- no smoke- ran like a champ- no check engine light on-
  • ivy96ivy96 Posts: 8
    Yeah, now I'm almost sure it's air intake! You do have a Mass Air Flow sensor, sorry, but I had mechanics tell me that I needed a new O2 sensor and Catalytic Converter literally 2 weeks after I had replaced them both! I don't trust them all, lol. No offense to your friend, but your Rodeo and mine are only a year apart (mine's a 96), if you have a Chilton guide, you can see it. and your MAP sensor COULD be the problem! I don't know about the crank shaft. Honestly, I am still learning about Isuzu's too. I've had mine for almost a year, but I've had to fix A LOT! Bought it from a shady used car dealer, but my husband and I love working on cars, so we took on the challenge. We learn as we go.
    Oh, by the way, if your check engine light is coming on, it's a SMOG issue, that's what that particular "dummy" light is for. Which tells me that you have an air issue for sure. Check your EGR valve. It should be on the other side of your throttle body then your IAC was. You should be able to just clean it out, replace the gasket and see if your car starts. And even if your check engine light is going out, there is still a problem, your engine's computer temporarily corrects or compensates for problems, that's why it goes out, but the longer you go without fixing the problem, the longer the light will stay on and the more often it will come on.
  • It cranked twice today for a few seconds then died. I smelled exhaust fumes pretty heavy. I am convinced also that it is air intake. It's not fuel, and unless the spark isnt good, I think it is air intake.

    Gotta tow it to the shop now. Been way to long not running. Any other ideas?

    I will check Mass Air Flow Sensor
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