LOST JEEPS :: View topic - Lifespan of a M.A.P. sensor

Mine was replaced at 20,000 miles because it was dirty. I found on here as well as others that if it is cleaned at every oil change, it won't need replacing. Also helps with the performance of the engine.

I just serviced ours this weekend, for it's 37,500 milestone.. oil, filters, etc.

While I was at it, I cleaned the MAP sensor. Wow, was that thing filthy! It was as crudded up as any of the pictures on the other thread (about cleaning the MAP). I mostly used a 'safe' carb cleaner to wash off the crud, and carefully used a toothpick to help ease the stubborn stuff away without touching the probe.

Prior to cleaning it, the engine had this stumble or bucking in the 55-60 mph range when I feathered the throttle on flat or slightly downhill grades. Not all the time, but enough to be annoying. Either lifting off the throttle completely, or pressing a little harder, would stop it.

After cleaning the MAP the engine is running smooth as silk everywhere - none of that bumping, bucking, stumble (etc) is evident at all. I've driven it for two days now (on the 3rd) really looking for any sign and I can't find the slightest... so, I'm very pleased at the results for far. There are some nice, long, downhill grades on I-5 as you drive south into Vancouver (WA) - and it runs beautifully on them all. In the past, if it could be felt anywhere it was there.

My theory is that the build up introduces a delay in the response of the sensor, such that the computer either "just gets it wrong" or the delay is significant enough where it goes back and forth trying to catch up to the sensor readings and because of the delay it 'overshoots' trying to correct.

I'll be watching very closely to see if this apparent improvement is sustained.

Mark
--

msilbernagel wrote:

What you are describing sounds like the infamous trans problem.

Yes... BUT, we purchased the rig a few months ago and prior to taking delivery they performed the recalls (F37? & ?) for both the transmission and tie-rods.

As for the symptoms, they weren't severe.. rather mild actually.

What was interesting to me is that cleaning the MAP made them go away completely - it hasn't run this smooth since we took delivery (w/about 29.500 miles).

I am thinking that while the torque converter issue is real - it may not be the whole problem.

The MAP could be unrelated and just another factor, or, the uneven performance with a gunked MAP could also contribute to early TQ or tranny failure... who knows?

Either way, I'm pleased with the results.

Mark
---

msilbernagel wrote:

What you are describing sounds like the infamous trans problem.

Could you PLEASE tell me/show a link to this infamous trans problem. My 05 has the exact same issue as rs4mtnitro does too!

Author:	hardieman [ Wed Jul 25, 2007 3:00 pm ]
Post subject:	Lifespan of a M.A.P. sensor
My M.A.P sensor is having to be replaced at 70 000kms ( +- 42 000 miles ) . Could one say that this is an acceptable lifespan for this unit ? Have any other members had to replace their sensors at this sort of mileage ?

Author:	onthehunt [ Wed Jul 25, 2007 7:18 pm ]
Post subject:
How many times did you clean it? If none, maybe it could be cleaned and reused. Sounds a little early for replacement, but if something were to go wrong on my crd I only hope it is something that easy and cheap to fix.

Author:	BlackLibertyCRD [ Wed Jul 25, 2007 7:52 pm ]
Post subject:
Mine was replaced at 20,000 miles because it was dirty. I found on here as well as others that if it is cleaned at every oil change, it won't need replacing. Also helps with the performance of the engine.

Author:	msilbernagel [ Mon Jul 30, 2007 2:34 pm ]
Post subject:
I just serviced ours this weekend, for it's 37,500 milestone.. oil, filters, etc. While I was at it, I cleaned the MAP sensor. Wow, was that thing filthy! It was as crudded up as any of the pictures on the other thread (about cleaning the MAP). I mostly used a 'safe' carb cleaner to wash off the crud, and carefully used a toothpick to help ease the stubborn stuff away without touching the probe. Prior to cleaning it, the engine had this stumble or bucking in the 55-60 mph range when I feathered the throttle on flat or slightly downhill grades. Not all the time, but enough to be annoying. Either lifting off the throttle completely, or pressing a little harder, would stop it. After cleaning the MAP the engine is running smooth as silk everywhere - none of that bumping, bucking, stumble (etc) is evident at all. I've driven it for two days now (on the 3rd) really looking for any sign and I can't find the slightest... so, I'm very pleased at the results for far. There are some nice, long, downhill grades on I-5 as you drive south into Vancouver (WA) - and it runs beautifully on them all. In the past, if it could be felt anywhere it was there. My theory is that the build up introduces a delay in the response of the sensor, such that the computer either "just gets it wrong" or the delay is significant enough where it goes back and forth trying to catch up to the sensor readings and because of the delay it 'overshoots' trying to correct. I'll be watching very closely to see if this apparent improvement is sustained. Mark -- BlackLibertyCRD wrote: Mine was replaced at 20,000 miles because it was dirty. I found on here as well as others that if it is cleaned at every oil change, it won't need replacing. Also helps with the performance of the engine.

Author:	rs4mtnitro [ Tue Jul 31, 2007 3:00 pm ]
Post subject:
msilbernagel wrote: I just serviced ours this weekend, for it's 37,500 milestone.. oil, filters, etc. While I was at it, I cleaned the MAP sensor. Wow, was that thing filthy! It was as crudded up as any of the pictures on the other thread (about cleaning the MAP). I mostly used a 'safe' carb cleaner to wash off the crud, and carefully used a toothpick to help ease the stubborn stuff away without touching the probe. Prior to cleaning it, the engine had this stumble or bucking in the 55-60 mph range when I feathered the throttle on flat or slightly downhill grades. Not all the time, but enough to be annoying. Either lifting off the throttle completely, or pressing a little harder, would stop it. After cleaning the MAP the engine is running smooth as silk everywhere - none of that bumping, bucking, stumble (etc) is evident at all. I've driven it for two days now (on the 3rd) really looking for any sign and I can't find the slightest... so, I'm very pleased at the results for far. There are some nice, long, downhill grades on I-5 as you drive south into Vancouver (WA) - and it runs beautifully on them all. In the past, if it could be felt anywhere it was there. My theory is that the build up introduces a delay in the response of the sensor, such that the computer either "just gets it wrong" or the delay is significant enough where it goes back and forth trying to catch up to the sensor readings and because of the delay it 'overshoots' trying to correct. I'll be watching very closely to see if this apparent improvement is sustained. Mark -- What you are describing sounds like the infamous trans problem.

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Author:	msilbernagel [ Tue Jul 31, 2007 5:38 pm ]
Post subject:
Yes... BUT, we purchased the rig a few months ago and prior to taking delivery they performed the recalls (F37? & ?) for both the transmission and tie-rods. As for the symptoms, they weren't severe.. rather mild actually. What was interesting to me is that cleaning the MAP made them go away completely - it hasn't run this smooth since we took delivery (w/about 29.500 miles). I am thinking that while the torque converter issue is real - it may not be the whole problem. The MAP could be unrelated and just another factor, or, the uneven performance with a gunked MAP could also contribute to early TQ or tranny failure... who knows? Either way, I'm pleased with the results. Mark --- rs4mtnitro wrote: msilbernagel wrote: I just serviced ours this weekend, for it's 37,500 milestone.. oil, filters, etc. While I was at it, I cleaned the MAP sensor. Wow, was that thing filthy! It was as crudded up as any of the pictures on the other thread (about cleaning the MAP). I mostly used a 'safe' carb cleaner to wash off the crud, and carefully used a toothpick to help ease the stubborn stuff away without touching the probe. -- What you are describing sounds like the infamous trans problem.

Author:	rs4mtnitro [ Tue Jul 31, 2007 5:52 pm ]
Post subject:
msilbernagel wrote: Yes... BUT, we purchased the rig a few months ago and prior to taking delivery they performed the recalls (F37? & ?) for both the transmission and tie-rods. As for the symptoms, they weren't severe.. rather mild actually. What was interesting to me is that cleaning the MAP made them go away completely - it hasn't run this smooth since we took delivery (w/about 29.500 miles). I am thinking that while the torque converter issue is real - it may not be the whole problem. The MAP could be unrelated and just another factor, or, the uneven performance with a gunked MAP could also contribute to early TQ or tranny failure... who knows? Either way, I'm pleased with the results. Mark --- There are a lot of people that have had the F37 done and are still having problems. I have cleaned my MAP twice and never noticed a difference. 27,000 miles on the clock now.

Author:	bentrod [ Tue Jul 31, 2007 6:34 pm ]
Post subject:
rs4mtnitro wrote: msilbernagel wrote: I just serviced ours this weekend, for it's 37,500 milestone.. oil, filters, etc. While I was at it, I cleaned the MAP sensor. Wow, was that thing filthy! It was as crudded up as any of the pictures on the other thread (about cleaning the MAP). I mostly used a 'safe' carb cleaner to wash off the crud, and carefully used a toothpick to help ease the stubborn stuff away without touching the probe. Prior to cleaning it, the engine had this stumble or bucking in the 55-60 mph range when I feathered the throttle on flat or slightly downhill grades. Not all the time, but enough to be annoying. Either lifting off the throttle completely, or pressing a little harder, would stop it. After cleaning the MAP the engine is running smooth as silk everywhere - none of that bumping, bucking, stumble (etc) is evident at all. I've driven it for two days now (on the 3rd) really looking for any sign and I can't find the slightest... so, I'm very pleased at the results for far. There are some nice, long, downhill grades on I-5 as you drive south into Vancouver (WA) - and it runs beautifully on them all. In the past, if it could be felt anywhere it was there. My theory is that the build up introduces a delay in the response of the sensor, such that the computer either "just gets it wrong" or the delay is significant enough where it goes back and forth trying to catch up to the sensor readings and because of the delay it 'overshoots' trying to correct. I'll be watching very closely to see if this apparent improvement is sustained. Mark -- What you are describing sounds like the infamous trans problem. Could you PLEASE tell me/show a link to this infamous trans problem. My 05 has the exact same issue as rs4mtnitro does too!

Author:	msilbernagel [ Tue Jul 31, 2007 7:15 pm ]
Post subject:
Here's a good start: http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?t=15086&highlight=f37+customer+satisfaction Mark -- rs4mtnitro wrote: What you are describing sounds like the infamous trans problem. bentrod wrote: Could you PLEASE tell me/show a link to this infamous trans problem. My 05 has the exact same issue as rs4mtnitro does too!

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