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#1 noahraysanders

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Posted 25 June 2009 - 02:42 PM

What would a bad Map sensor cause my engine to do? I have a 2002 silverado 5.3 liter

#2 KYoutback

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Posted 25 June 2009 - 03:14 PM

What would a bad Map sensor cause my engine to do? I have a 2002 silverado 5.3 liter



It would cause your NAV unit to take you to incorrect destinations. (Sorry couldn't resist)


I think you mean MAF sensor. And when mine needed cleaning it caused an occasional stutter in the engine like a misfire. Cleaned it and it's been fine ever since. There may be other symptoms as well.
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#3 Draenor

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Posted 25 June 2009 - 03:43 PM

The engine would run rough. It would also run poor under a load, since the ECM cannot see the vacuum it will not advance(or retard) timing.


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#4 brims

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Posted 25 June 2009 - 05:17 PM

What would a bad Map sensor cause my engine to do? I have a 2002 silverado 5.3 liter



It would cause your NAV unit to take you to incorrect destinations. (Sorry couldn't resist)


I think you mean MAF sensor. And when mine needed cleaning it caused an occasional stutter in the engine like a misfire. Cleaned it and it's been fine ever since. There may be other symptoms as well.


There's a MAP (manifold air pressure) and a MAF (mass air flow) sensor. I'm not sure what a bad MAP sensor would do, but it sounds like John answered that.
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#5 KYoutback

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Posted 25 June 2009 - 06:29 PM

What would a bad Map sensor cause my engine to do? I have a 2002 silverado 5.3 liter



It would cause your NAV unit to take you to incorrect destinations. (Sorry couldn't resist)


I think you mean MAF sensor. And when mine needed cleaning it caused an occasional stutter in the engine like a misfire. Cleaned it and it's been fine ever since. There may be other symptoms as well.


There's a MAP (manifold air pressure) and a MAF (mass air flow) sensor. I'm not sure what a bad MAP sensor would do, but it sounds like John answered that.


My apologies. It just jumped out at me and I went with it.
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#6 brims

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Posted 25 June 2009 - 07:42 PM

What would a bad Map sensor cause my engine to do? I have a 2002 silverado 5.3 liter



It would cause your NAV unit to take you to incorrect destinations. (Sorry couldn't resist)


I think you mean MAF sensor. And when mine needed cleaning it caused an occasional stutter in the engine like a misfire. Cleaned it and it's been fine ever since. There may be other symptoms as well.


There's a MAP (manifold air pressure) and a MAF (mass air flow) sensor. I'm not sure what a bad MAP sensor would do, but it sounds like John answered that.


My apologies. It just jumped out at me and I went with it.


Just trying to help out.
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2008 Chevrolet Silverado 1500 Extended Cab Standard Box, 2LT, 4x2, 5.3L FlexFuel, 3.73 G80, Graystone Metallic, General Grabber HTS 245/70R17
Mods: Line-X over the rail, WeatherGuard Crossbox, Optima Red Top, MagHytec Differential Cover, Rough Country 2" leveling kit, Corvette Servo, AEM Brute Force Intake, Black Bear tune, Hayden 679 aux trans cooler, Hawk pads, Bilstein shocks, Dual Aeroforce Interceptors, Extang Snapless Full Tilt Tool Box Tonneau
Future mods: 2 low/6 high
Possible mods: rear sway bar, blacked out front and rear bumpers

#7 noahraysanders

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Posted 25 June 2009 - 09:37 PM

What would a bad Map sensor cause my engine to do? I have a 2002 silverado 5.3 liter



It would cause your NAV unit to take you to incorrect destinations. (Sorry couldn't resist)


I think you mean MAF sensor. And when mine needed cleaning it caused an occasional stutter in the engine like a misfire. Cleaned it and it's been fine ever since. There may be other symptoms as well.


There's a MAP (manifold air pressure) and a MAF (mass air flow) sensor. I'm not sure what a bad MAP sensor would do, but it sounds like John answered that.


My apologies. It just jumped out at me and I went with it.


Just trying to help out.




its just that my rpms surge when im driving 40-50 mph and someone told me it could be my map sensor. i just replaced my knock sensors and while i was in there i cleaned my map sensor with brake fluid to see if that would help but engine is still surging.. no one on this site has been able to figure it out.

#8 brims

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Posted 25 June 2009 - 10:21 PM

I don't think brake fluid is the right thing to use on the MAP sensor, or MAF for that matter. It may be toast.
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2008 Chevrolet Silverado 1500 Extended Cab Standard Box, 2LT, 4x2, 5.3L FlexFuel, 3.73 G80, Graystone Metallic, General Grabber HTS 245/70R17
Mods: Line-X over the rail, WeatherGuard Crossbox, Optima Red Top, MagHytec Differential Cover, Rough Country 2" leveling kit, Corvette Servo, AEM Brute Force Intake, Black Bear tune, Hayden 679 aux trans cooler, Hawk pads, Bilstein shocks, Dual Aeroforce Interceptors, Extang Snapless Full Tilt Tool Box Tonneau
Future mods: 2 low/6 high
Possible mods: rear sway bar, blacked out front and rear bumpers

#9 2500sierra

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Posted 27 June 2009 - 01:41 AM

The MAP sensor may have something to do with you surging and what you might think is a tcc lockup issue. I am not sure but i know on my older truck (TH 350C tranny) it used a vacuum diaphragm switch to disengage lockup under heavy loads. Sounds like the MAP sensor is replacing that old style switch.
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#10 Draenor

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Posted 27 June 2009 - 07:01 AM

I don't think brake fluid is the right thing to use on the MAP sensor, or MAF for that matter. It may be toast.

+1 That was not a good idea to use the brake fluid.

The MAP sensor may have something to do with you surging and what you might think is a tcc lockup issue. I am not sure but i know on my older truck (TH 350C tranny) it used a vacuum diaphragm switch to disengage lockup under heavy loads. Sounds like the MAP sensor is replacing that old style switch.

+1 It sounds like the TCC is not locking up correctly.

The torque converter clutch solenoid is going out. It is in the valve body and can easily be replaced.

Are you getting ant DTCs?


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#11 alwcurlz

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Posted 27 June 2009 - 10:12 AM

I don't think brake fluid is the right thing to use on the MAP sensor, or MAF for that matter. It may be toast.

+1 That was not a good idea to use the brake fluid.

The MAP sensor may have something to do with you surging and what you might think is a tcc lockup issue. I am not sure but i know on my older truck (TH 350C tranny) it used a vacuum diaphragm switch to disengage lockup under heavy loads. Sounds like the MAP sensor is replacing that old style switch.

+1 It sounds like the TCC is not locking up correctly.

The torque converter clutch solenoid is going out. It is in the valve body and can easily be replaced.

Are you getting ant DTCs?


I think he may have meant "brake cleaner" maybe? I've used brake cleaner spray on things that would have needed carb cleaner spray since they do the same thing and work just as well. :thumbs:

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#12 brims

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Posted 27 June 2009 - 02:21 PM

They sell MAF cleaner, which I would venture to say is the right thing to use. Could be a bunch of bull, but could be true.
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2008 Chevrolet Silverado 1500 Extended Cab Standard Box, 2LT, 4x2, 5.3L FlexFuel, 3.73 G80, Graystone Metallic, General Grabber HTS 245/70R17
Mods: Line-X over the rail, WeatherGuard Crossbox, Optima Red Top, MagHytec Differential Cover, Rough Country 2" leveling kit, Corvette Servo, AEM Brute Force Intake, Black Bear tune, Hayden 679 aux trans cooler, Hawk pads, Bilstein shocks, Dual Aeroforce Interceptors, Extang Snapless Full Tilt Tool Box Tonneau
Future mods: 2 low/6 high
Possible mods: rear sway bar, blacked out front and rear bumpers

#13 noahraysanders

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Posted 27 June 2009 - 06:21 PM

I don't think brake fluid is the right thing to use on the MAP sensor, or MAF for that matter. It may be toast.

+1 That was not a good idea to use the brake fluid.

The MAP sensor may have something to do with you surging and what you might think is a tcc lockup issue. I am not sure but i know on my older truck (TH 350C tranny) it used a vacuum diaphragm switch to disengage lockup under heavy loads. Sounds like the MAP sensor is replacing that old style switch.

+1 It sounds like the TCC is not locking up correctly.

The torque converter clutch solenoid is going out. It is in the valve body and can easily be replaced.

Are you getting ant DTCs?


whats a dtc?

#14 2500sierra

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Posted 27 June 2009 - 07:10 PM

Diagnostic Trouble Code AKA is your service engine soon light on?
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Other Rides

93 Fox Mustang (soon to be Chevy powered)
83 Silverado, 454, 40'' Boggers, lots-o-lift.
79 Silverado Farm machine
A tricked out Huffy for when the above crap breaks!


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#15 spurshot

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Posted 30 June 2009 - 08:45 AM

Just to add to the confusion, I believe that the MAP has a feedback to the ECM/TCM for control of timing and fuel flow as well as shift points and torque converter lockup.

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