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10-01-2006, 12:56 AM | #1 | |
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99 Rodeo trouble codes - MAF or VAF High input/Low input
'99 Rodeo LS, V6, 3.2L, M/T, 2WD
I have to baby it at stops juggling the clutch, gas, and parking brake to keep it from stalling for the last 2 days. The idle comes down fast and will stall more often than not. After a freeway drive the idle will sometimes stay high for about 30 seconds or so, around 3K RPM, but will then come down to somewhere near normal. Driving on the open road is no problem though I'm not sure how much it's impacting my gas milage. Local mechanic read out these two codes:
I'm wondering if it's a faulty sensor since it's seeing both a high input and a low input. Last time it ran like this the fix was replacing the fuel pressure regulator. I'll be looking this up in my shop manual. If anyone has experienced input on these codes it would be GREATLY appreciated. Once I have it fixed I'll submit a full, detailed posting as always. Thanks, Mark Huntington Beach, Ca. dingo01@verizon.net |
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10-01-2006, 11:22 PM | #2 | |
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Re: 99 Rodeo trouble codes - MAF or VAF High input/Low input
Sounds like a classic case of a bad intake manifold gasket. See the Faq's for more info.
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-Ryan Isuzu Moderator Car Show Tips Operations manager with a results-driven passion for process improvement FAQ 98-04 Isuzu Rodeo, Rodeo Sport, Amigo, Trooper SOLD - NOV2015 - 2000 Amigo, V6, HT winter, ST summer, 2wd |
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10-02-2006, 09:25 AM | #3 | |
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Re: 99 Rodeo trouble codes - MAF or VAF High input/Low input
Thanks for the input Ryan. I thought about the IMG's as well. At least this time the problem isn't intermittent. I can't hear it sucking air at the IMG, but I'll have to check it a little closer. I'll post my findings for sure.
Mark |
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10-02-2006, 10:17 PM | #4 | |
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Re: 99 Rodeo trouble codes - MAF or VAF High input/Low input
It was the MAF sensor (Mass Air Flow sensor). It sits between the air filter and the throttle valve.
I started out with these 2 trouble codes: P0102 MAF or VAF CKT Low Input P0103 MAF or VAF CKT High Input I erased them several times and eventually would always get only the P0102. I removed the MAF sensor (extremely easy) and gave it a good visual. Thing is that it has these really tiny sensors suspended in the air that register air flow in relation to throttle position which they feed back to the PCM (Power Control Module or main computer) in order to control fuel flow. There's no way to tell if they're bad when they all look intact. I read the 5 volts to it from the PCM easily enough as per the shop manual, but I didn't have a scanner so that I could read the frequency at specific RPMs. It could have been the PCM, the MAF, the wiring in between, or maybe even the IMG's as a remote possibility. I couldn't determine 100% that it was the MAF on my own. I didn't want to take a shot at it since the part isn't cheap and then if I had made the wrong choice have to end up also buying a PCM which has to be programmed when installed, and I also don't have tons of time to rip the vehicle wiring apart. I brought it to a trusted local mechanic down the street who has the equipment and the time, showed him what I had found, and he verified that it's the MAF that's bad. I'll pick it up tomorrow morning and if everything is as it now stands, that will be the last entry for this excursion. I guess it's better than buying the part and finding out that that wasn't it. Alls well that ends. I hope this info comes in useful for someone. Hopefully Ryan can add it to the FAQ's under the P0102/P0103 diagnostic trouble code heading. Mark Huntington Beach, Ca. dingo01@verizon.net |
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10-02-2006, 10:26 PM | #5 | |
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Re: 99 Rodeo trouble codes - MAF or VAF High input/Low input
added to the faq's.
-Ryan
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-Ryan Isuzu Moderator Car Show Tips Operations manager with a results-driven passion for process improvement FAQ 98-04 Isuzu Rodeo, Rodeo Sport, Amigo, Trooper SOLD - NOV2015 - 2000 Amigo, V6, HT winter, ST summer, 2wd |
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10-03-2006, 09:51 PM | #6 | |
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Re: 99 Rodeo trouble codes - MAF or VAF High input/Low input
The MAF sensor fixed it. This problem had been occurring for about 2 years or more and was intermittent. Every 4 to 6 months I'd have trouble keeping it running at stops, and here and there the idle would go up to 3 grand or so for a bit. Then it would literally just disappear and it would run perfectly fine.
This time it broke all the way and gave me the CEL which hadn't occurred up to this point. The End. Mark Huntington Beach, Ca. |
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10-03-2006, 10:41 PM | #7 | |
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Re: 99 Rodeo trouble codes - MAF or VAF High input/Low input
Thanks for posting. What did the part cost? There have been a couple of posts about the idle surging intermittently, as mine has. I'll remember to check the MAF if it happens again.
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10-06-2006, 10:04 PM | #8 | |
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Re: 99 Rodeo trouble codes - MAF or VAF High input/Low input
The part was $180. I found it at a few dealers for $155, but it's on national back-order. For some reason they're really hard to get. I've seen remanufactured ones on the internet for around $83. The one I ended up getting has a one year warranty.
If you don't already have one, you should pick up an OBDII trouble code reader. I picked one up at Harbor Freight for $49.99. They're really simple to use. I had a problem with really erratic idling a few years ago and that time it ended up being the fuel pressure regulator. The MAF is simple to replace. All you need is a screwdriver. It's tough to tell if it's bad, but if you get the same trouble codes I did, there's a very good chance that it's bad. Thing is, it could also be the Power Control Module (PCM) or the wiring in between. Good luck with yours. Mark |
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