No power
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
A boost gage will tell you real quick.
MAP = Manifold Absolute Pressure.
Simple explaination: It senses the pressure from the turbo and relays the info to the PCM for fuel regulation.
Thread Starter
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
Just to make sure Im understanding you right..........
I unplugged it and the truck ran better.
This means the sensor is OK?
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
I also have the same question, I think it means that the sensor is BAD.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
The MAP may be Bad.
Did you check the rubber hose going to it? Could have a pin-hole or might be plugged.
Before you buy a new one try swapping in a known good one or get the truck scanned.
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
Thread Starter
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
Fuel pressure seems to be around 43 psi.
At least thats what this guage read 3 times after squirting me in the face with diesel.
At least thats what this guage read 3 times after squirting me in the face with diesel.
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Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Yep the MAp sensor is bad. The engine is running off the PCM when it's unplugged. It guesses at the proper amount of boost it should have. It will
run much better with a new MAP sensor. You can find the part number in in my signature.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
That's for the 1999-2003 trucks. I'm not a real fan of fooling any sensor on our trucks.
That tells the PCM that the boost levels are safe and will not de-fuel the engine. If you want more power then a chip/injectors is the way to go.
That tells the PCM that the boost levels are safe and will not de-fuel the engine. If you want more power then a chip/injectors is the way to go.
Thread Starter
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
One more question?
I phoned my usual auto parts supplier and he cant find that sensor anywhere in his supply system but if he did have one it would be $120.00 , does that sound right?
I phoned my usual auto parts supplier and he cant find that sensor anywhere in his supply system but if he did have one it would be $120.00 , does that sound right?
Junior User
Joined: Nov 2008
Posts: 50
Likes: 0
From: Ely, NV
this is what i found online at Auto Parts Fast at RockAuto
ACDELCO Part # 2132194 {#89053423}
MAP Sensor TO 1/5/98, F4TZ-9F479A
MAP Sensor F4TZ-9F479A
$142.79
ACDELCO Part # 2132194 {#89053423}
MAP Sensor TO 1/5/98, F4TZ-9F479A
MAP Sensor F4TZ-9F479A
$142.79
Logistics Pro
Joined: Jul 2001
Posts: 4,137
Likes: 41
From: Marble Falls, Texas
Okay, here's another idea..... I was reading on the SD forum about another guys thats kinda having the same issue, no power, smoke etc. Turns out that there is a filter assembly in the fuel pickup in the tank that can be clogged. Okay, now our trucks are most likely different, but what it DOES make me think about, is the fuel pickup tubes. I think I remember that a few people had problems with pickup tubes....... I don't remember exactly what, but it gave them these issues as well. I still could be other things mention before, I know you are waiting on parts. But this is another idea...... This problem along with your SD vibs are bugging the crap of me. I actually think about this sh@t when I'm not on here. Sad I guess.