over-boost
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Well Odds are getting little more now the MAF Could be BAD and could contribute to the overboost issue
1. You have a MAF DTC
2. Sprayed with break cleaner
Did you ever get a MAF reading on your Scanner before when it was running good??
I assume you cleaned the MAF after the OverBoost condition poped up???Is this true??
If you had a DVM you could backprobe the MAF sensor and check it that way Just Keep in mind the IAT is Part of the same sensor so MUST be CERTAIN what wire does what theres a wire diagram in tech fold would help figure the plug Pinout
Might be worth a Shot BEFORE you change the sensor out Cuz might be issue with the Wire Harness to MAF and NOT the MAF Sensor itself
1. You have a MAF DTC
2. Sprayed with break cleaner
Did you ever get a MAF reading on your Scanner before when it was running good??
I assume you cleaned the MAF after the OverBoost condition poped up???Is this true??
If you had a DVM you could backprobe the MAF sensor and check it that way Just Keep in mind the IAT is Part of the same sensor so MUST be CERTAIN what wire does what theres a wire diagram in tech fold would help figure the plug Pinout
Might be worth a Shot BEFORE you change the sensor out Cuz might be issue with the Wire Harness to MAF and NOT the MAF Sensor itself
Thread Starter
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Senior User
Joined: Nov 2002
Posts: 120
Likes: 0
From: cookeville us
i was having a low boost problem wit low map readings amd maf. had a really bad idle tll net. truck still wont get over 188 but had huge numbers in air flow.t got rid of miss and low power
i cleaned map tube, ran seafoam threw oil and fuel. it got rid of miss and low power
i cleaned map tube, ran seafoam threw oil and fuel. it got rid of miss and low power
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Oh so you had opposite before Low Boost then Cleaned the MAF and went to OverBoost conditions
I would try to use a DVM to check the MAF sensor output and the wire harness to it
It could have a short/ pinched wire or something and going crazy from moving the Wire Harness around
MAF sensor or wiring to it could be BAD so Im just covering all the Bases
Hate to see you install a new MAF and Have the same problems
But if your not to worried about buying a new MAF go for it everything kinda points to MAF anyway
BUT Beware I got Bit over a similar Deal the other day guy had bad MAP reading so change the MAP sensor and still had Bad Reading I felt Bad as should have trouble shoot it further to be certain
I would try to use a DVM to check the MAF sensor output and the wire harness to it
It could have a short/ pinched wire or something and going crazy from moving the Wire Harness around
MAF sensor or wiring to it could be BAD so Im just covering all the Bases
Hate to see you install a new MAF and Have the same problems
But if your not to worried about buying a new MAF go for it everything kinda points to MAF anyway
BUT Beware I got Bit over a similar Deal the other day guy had bad MAP reading so change the MAP sensor and still had Bad Reading I felt Bad as should have trouble shoot it further to be certain
Thread Starter
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Senior User
Joined: Nov 2002
Posts: 120
Likes: 0
From: cookeville us
pin tested harness and verdict is bad maf. ill have one here saturday and post if that was the cure.
btw
baro koeo
97.5 kpa
4.15v
map 97.0kpa
1.25v
2500 rpm
baro no change
mao 159.2kpa
3.19v
btw
baro koeo
97.5 kpa
4.15v
map 97.0kpa
1.25v
2500 rpm
baro no change
mao 159.2kpa
3.19v
Elder User
Joined: Aug 2003
Posts: 933
Likes: 0
From: Québec
I cleaned mine with Kleen Flow carb and intake cleaner, I thing it is a softer fluid since it is made to shoot right in the intake, although I did not shoot in the intake, I cleaned it just because I had it out, everything is OK so far, hope it stays this way.
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Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
OPERATING VALUES
Just make shure the numbers are taken exactly like this
Truck in PARK OR NEUTRAL all times during test
ECT at 190* or close to
-------------------------------------------------------------------
KOEO=Key On Engine Off =record value
Low Idel (truck idel on its own)=record value
High Idel (2500RPM)=record value
Values below are given in this order^^^Left to right
BARO 96.5 (14) 96.5 (14) 96.5 (14) 50 - 120 (7.3 - 17.4) kPa (PSI) Barometric Pressure
MAF 0 1.44 2.65 0.5 - 4.75 VOLT Mass Air Flow
MAP 96 (14) 96 (14) 103 (15) 41 - 324 (6 - 47) kPa (PSI) Manifold Absolute Pressure
MAP_V 1.30 1.33 1.40 0.5 - 4.5 VOLT Manifold Absolute Pressure
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Your Last one MAO should be MAP do I have that right??
High Idel(2500rpm) MAP should hjave been 1.40volt you have 3.19volt
Did you spray Brake Cleaner in the MAP sensor too???
I got these Values from CHEEZIT so there GOOD Numbers THANKS AGAIN CHEEZIT
All you posted was KOEO and High Idel Numbers right
NONE were Low Idel am I still on the same page Here??????????????????????????????????????????
High Idel(2500rpm) MAP should hjave been 1.40volt you have 3.19volt
Did you spray Brake Cleaner in the MAP sensor too???
I got these Values from CHEEZIT so there GOOD Numbers THANKS AGAIN CHEEZIT
All you posted was KOEO and High Idel Numbers right
NONE were Low Idel am I still on the same page Here??????????????????????????????????????????
Thread Starter
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Senior User
Joined: Nov 2002
Posts: 120
Likes: 0
From: cookeville us
Your Last one MAO should be MAP do I have that right?? High Idel(2500rpm) MAP should hjave been 1.40volt you have 3.19volt Did you spray Brake Cleaner in the MAP sensor too??? I got these Values from CHEEZIT so there GOOD Numbers THANKS AGAIN CHEEZIT All you posted was KOEO and High Idel Numbers right NONE were Low Idel am I still on the same page Here??????????????????????????????????????????
correct should be map
i didnt clean MAP
and yes i didnt post idle numbers. ( forgot sorry)
at 2500 rpm even in nutral boost was over 14 psi, i ordered a new MAP and MAF should be here tomorrow.
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Good Deal
Just the MAF replaced Fixed it
Did you Install the New MAP Sensor to
I remember you said you ordered Both
Guess I just trying to see What Sensor did it I assume the MAF Sensor was the Ticket
MAF sensors dont Fail often guess the Brake Cleaner Killed it
THANKS for Posting the Final Result
Thread Starter
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Senior User
Joined: Nov 2002
Posts: 120
Likes: 0
From: cookeville us
I ordered both but only replaced the MAF. I figured what were the chances of them both going bad at same time.
Although in the last 2 weeks i had
EGR cooler fail,
Alternator fail
MAF fail
#8 injector came apart
And oil cooler stopped up
so ya never know for sure. lol
Although in the last 2 weeks i had
EGR cooler fail,
Alternator fail
MAF fail
#8 injector came apart
And oil cooler stopped up
so ya never know for sure. lol