ICP mod, unexpected results
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Test I described is a going around the block thing. Not pulling hills or racing down the road. It is a dirt simple work or no work on the MAP. If under the circumstances I've described the truck runs better with the MAP unplugged then some investigation on the MAP or hose should be in order.
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Logistics Pro
Joined: Oct 2008
Posts: 4,818
Likes: 1
From: Avilla, IN
Alright, last night the kid did the said tests.
He said it ran terrible with the ICP unplugged.
He said he couldn't really tell a difference with the MAP unplugged. I had him check the hose. After he broke the end off, from dry rot, I determined that wasn't the problem.
So does that mean the MAP is bad?
He said it ran terrible with the ICP unplugged.
He said he couldn't really tell a difference with the MAP unplugged. I had him check the hose. After he broke the end off, from dry rot, I determined that wasn't the problem.
So does that mean the MAP is bad?
Post Fiend
Joined: Feb 2009
Posts: 8,773
Likes: 1
From: Texas Coast
If the map is working the truck should run worse or beter with it unplugged (wires) unplugged not the hose. So he should pull the wiring harness off the map and see how it runs. Then have him remove the hose from the turbo discharge and check to ensure that the small hole inside is not fouled out.
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Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
^^^ that's what he did. When it didn't run any different I had him remove the hose and inspect. Guess I wasn't too clear on what he did. I'll have him get a new sensor then.
Senior User
Joined: Nov 2003
Posts: 111
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From: Auburn
It is my understanding that the MAP sensor sends voltage to the PCM so it can adjust how the motor is running. When you unplug the MAP harness the PCM reverts to a predetermined voltage. That is why if the MAP sensor is bad, it will run better with it unplugged. At least that is how I understand it. If there was no difference I would change the MAP out. Adam
Post Fiend
Joined: Feb 2009
Posts: 8,773
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From: Texas Coast
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Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
Laughing Gas
Joined: Feb 2009
Posts: 921
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From: Denver CO
Its been my experience that if there is a dramatic change either way with it unplugged ie. running much better or much worse, then the sensor is bad. Because the signal from it is fouled somehow, either causing defueling or overfueling, due to a misread of the air in the mix.
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