99 Caravan Engine Hestitation p0505 code
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99 Caravan Engine Hestitation p0505 code
I have a 1999 Dodge Caravan 3.0 liter 6 cylinder base model with problems.
It hesitates when accelerating, especially when going uphill. It feels like it actually hesitates worse when I depress the gas pedal more. When it does this it also backfires inside the engine, not out of the tailpipe, it sounds like it's misfiring.
Here is what I've had done over the past year:
In Sept 2012 got new speed input/output sensors on the transmission, this seemed to solve it for a while.
In Nov 2012 it started again, even stalled out a couple times when I was coming to a stop. Firestone pulled a too lean fuel code off of it, recommended I replaced fuel pump. Also found out the MIL was broken (they said $700 to replace cause they'd have to pull the dash).
In December I got fuel pump and filter replaced at a local shop, still had the same problem, they asked me about past problems, was it parked outside for a long time, etc. I told them we had had water leak onto the passenger side floor, cause the cowel drains had gotten too clogged, and had to be cleaned out at the shop in Feb 2012. They concluded that when this happened, it was likely the computer had gotten wet, so they checked, and sure enough, the computer had water in it.
Replaced computer in Dec 2012 at the dealership. They had a difficult time programming the new computer, and once programmed, the van still had same hesitation problem. They tried a different computer in case the new one was faulty, still the same problem. That dealership could not figure out what was wrong, thought maybe a timing issue.
Took it to another dealership in Jan 2013, they said it had the lean fuel code (same one it's had the whole time), and that it needs new fuel injectors. Injectors would be very expensive, so I take it to the most reliable shop I know of.
This shop won't even look at it until I get a new check engine light, cause it has been out since at least Nov. I get that, they replace it and start diagnosis. They don't know what it is and don't want to just start replacing parts randomly. It's now giving out the Idle Air Control code p0505. Thing is, it idles fine, great actually. It only has problems when a load it put on the engine when accelerating, like uphills, then it slows way down and is nonresponsive to gas pedal.
What is wrong with it? Anyone else had this problem and gotten it figured out? This is my boss's van (I'm his assistant, it's my job to get it fixed), so I'd really like to stop wasting his money chasing down phantom broken parts that don't fix the problem. HELP!
It hesitates when accelerating, especially when going uphill. It feels like it actually hesitates worse when I depress the gas pedal more. When it does this it also backfires inside the engine, not out of the tailpipe, it sounds like it's misfiring.
Here is what I've had done over the past year:
In Sept 2012 got new speed input/output sensors on the transmission, this seemed to solve it for a while.
In Nov 2012 it started again, even stalled out a couple times when I was coming to a stop. Firestone pulled a too lean fuel code off of it, recommended I replaced fuel pump. Also found out the MIL was broken (they said $700 to replace cause they'd have to pull the dash).
In December I got fuel pump and filter replaced at a local shop, still had the same problem, they asked me about past problems, was it parked outside for a long time, etc. I told them we had had water leak onto the passenger side floor, cause the cowel drains had gotten too clogged, and had to be cleaned out at the shop in Feb 2012. They concluded that when this happened, it was likely the computer had gotten wet, so they checked, and sure enough, the computer had water in it.
Replaced computer in Dec 2012 at the dealership. They had a difficult time programming the new computer, and once programmed, the van still had same hesitation problem. They tried a different computer in case the new one was faulty, still the same problem. That dealership could not figure out what was wrong, thought maybe a timing issue.
Took it to another dealership in Jan 2013, they said it had the lean fuel code (same one it's had the whole time), and that it needs new fuel injectors. Injectors would be very expensive, so I take it to the most reliable shop I know of.
This shop won't even look at it until I get a new check engine light, cause it has been out since at least Nov. I get that, they replace it and start diagnosis. They don't know what it is and don't want to just start replacing parts randomly. It's now giving out the Idle Air Control code p0505. Thing is, it idles fine, great actually. It only has problems when a load it put on the engine when accelerating, like uphills, then it slows way down and is nonresponsive to gas pedal.
What is wrong with it? Anyone else had this problem and gotten it figured out? This is my boss's van (I'm his assistant, it's my job to get it fixed), so I'd really like to stop wasting his money chasing down phantom broken parts that don't fix the problem. HELP!
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I see a couple of huge red BS flags!
Really? A PCM (your "computer") is waterlogged because of clogged cowl drains? Really? Did they show it to you and was it a PCM they showed you? Anything else would have nothing to do with your problem. The PCM is bolted to the fender wall next to the battery in the forward right hand corner of the engine compartment. Cowl drains drain water out of the windshield wiper well just in front of the windshield. Impossible! On top of that, the PCM is a well sealed unit. Oh, by the way, a dealership will charge you three times and more what you would pay to buy and replace a PCM yourself. You can get PCMs for $200 preprogrammed and ready to install from multiple internet sources. Some parts stores sell them.
They won't troubleshoot because the service engine soon (MIL) light "socket" is broken and therefore the light won't turn on. Was that it? Stay away from that shop in the future. They can check for codes or run trim checks regardless.
Did anyone check for a vacuum leak? In this link they refer to a MAF sensor. You have a MAP sensor. Slightly different but same function.http://www.obd-codes.com/p0171
.http://www.obd-codes.com/p0505 Only time the IAC valve effects the system is when your foot is off the gas pedal.
If it weren't for the code I would be suggesting getting the cat converter pressure tested. Might be worth it anyway. Could be clogged to some degree. If you bang on it and it sounds like it's full of sand it's time to replace it.
Backfiring out the intake is a sign of a lean fuel problem.
Really? A PCM (your "computer") is waterlogged because of clogged cowl drains? Really? Did they show it to you and was it a PCM they showed you? Anything else would have nothing to do with your problem. The PCM is bolted to the fender wall next to the battery in the forward right hand corner of the engine compartment. Cowl drains drain water out of the windshield wiper well just in front of the windshield. Impossible! On top of that, the PCM is a well sealed unit. Oh, by the way, a dealership will charge you three times and more what you would pay to buy and replace a PCM yourself. You can get PCMs for $200 preprogrammed and ready to install from multiple internet sources. Some parts stores sell them.
They won't troubleshoot because the service engine soon (MIL) light "socket" is broken and therefore the light won't turn on. Was that it? Stay away from that shop in the future. They can check for codes or run trim checks regardless.
Did anyone check for a vacuum leak? In this link they refer to a MAF sensor. You have a MAP sensor. Slightly different but same function.http://www.obd-codes.com/p0171
.http://www.obd-codes.com/p0505 Only time the IAC valve effects the system is when your foot is off the gas pedal.
If it weren't for the code I would be suggesting getting the cat converter pressure tested. Might be worth it anyway. Could be clogged to some degree. If you bang on it and it sounds like it's full of sand it's time to replace it.
Backfiring out the intake is a sign of a lean fuel problem.
Last edited by Cougar41; Feb 14, 2013 at 05:10 PM.
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Maybe?
It has had the too lean fuel code before, and a fuel system pressure test was performed and they decided the fuel pump needed replacing.
Yeah, it's been throwing all sorts of codes that don't make sense. The shop I have it at now did say I needed to replace my check engine light, so I got one off of ebay and they put it in for me ($130).
The PCM had water in it, that's why it got replaced, either way, it's a new computer in it now and it was flashed and programmed by the dealership.
They checked for vacuum leaks, none to be found. New MAP sensor and throttle position sensor were tried out, no improvement.
Shop it's at now says it's definitely not the injectors, or a vacuum leak. I'll ask them about the catalytic converter. They've always been able to fix everything I've thrown at them, this is the first time I've had them stumped.
Could there just be a short somewhere that's causing all this?
Yeah, it's been throwing all sorts of codes that don't make sense. The shop I have it at now did say I needed to replace my check engine light, so I got one off of ebay and they put it in for me ($130).
The PCM had water in it, that's why it got replaced, either way, it's a new computer in it now and it was flashed and programmed by the dealership.
They checked for vacuum leaks, none to be found. New MAP sensor and throttle position sensor were tried out, no improvement.
Shop it's at now says it's definitely not the injectors, or a vacuum leak. I'll ask them about the catalytic converter. They've always been able to fix everything I've thrown at them, this is the first time I've had them stumped.
Could there just be a short somewhere that's causing all this?