98 missing from 45MPH to 55 MPH when accelerating
Thread Starter
Intermediate
Joined: Sep 2010
Posts: 30
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98 missing from 45MPH to 55 MPH when accelerating
My 98 has a problem when accelerating slowly at about 45MPH to about 55 MPH. If I stomp on it it moves out w/o the hessitation/miss. I am not getting any DIC codes related to any engine sensor. I am at a loss to what's up with this. I have about 50K miles on the car and until the past three months I never had any problems with the motor/electrical/sensor systems. It is an auto tranny model convertible.
Any chance that it could be an O2 sensor or a MAF problem? I was hoping to find a code that would point me in the right direction but there's no current codes at all and the only codes showing are HVAC issues, power seat sensor position , and a few communications codes. All are history codes.
Any help will be apreciated.
Roy in Phoenix
Any chance that it could be an O2 sensor or a MAF problem? I was hoping to find a code that would point me in the right direction but there's no current codes at all and the only codes showing are HVAC issues, power seat sensor position , and a few communications codes. All are history codes.
Any help will be apreciated.
Roy in Phoenix
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
In that case, you probably need to look for vacuum leaks such as at the PCV valve. Another possibility would be the plug wires themselves. How many miles on your car? Wires ever changed and/or plugs? Clear your codes and see if any come back but make sure you write down which are there now.
Thread Starter
Intermediate
Joined: Sep 2010
Posts: 30
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Car missing
I have about 50K miles on the car. The plugs and wires are orginal, I have no codes relating to the engine or any sensor code that would cause a miss. The car only misses during light acceleration between 45 and 55 MPH.
I did check the hose from the PVC valve to the intake manifold and it seems secure, w/o any leaks that I could detect.
TY for any help.
Roy in Phoenix
I did check the hose from the PVC valve to the intake manifold and it seems secure, w/o any leaks that I could detect.
TY for any help.
Roy in Phoenix
In that case, you probably need to look for vacuum leaks such as at the PCV valve. Another possibility would be the plug wires themselves. How many miles on your car? Wires ever changed and/or plugs? Clear your codes and see if any come back but make sure you write down which are there now.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
At 12 years old, I would be replacing those wires anyway. If you haven't already, spray out the MAF with either electrcal parts cleaner or brake cleaner from a spray can. Do not touch the element inside and only do this after the engine is cold. Next, you'll probably need to look at the fuel pressure at the fuel rail and see what you are getting through the RPM range.
Thread Starter
Intermediate
Joined: Sep 2010
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Vette Missing
TY for the suggestions. Do I need to remove the MAF completely to spray it?
Roy in Phoenix
Roy in Phoenix
At 12 years old, I would be replacing those wires anyway. If you haven't already, spray out the MAF with either electrcal parts cleaner or brake cleaner from a spray can. Do not touch the element inside and only do this after the engine is cold. Next, you'll probably need to look at the fuel pressure at the fuel rail and see what you are getting through the RPM range.
Melting Slicks
Joined: Apr 2002
Posts: 2,631
Likes: 2
From: Clever, MO aka SOMO
My car stumble upon low speed acceleration without any DIC messages etc., but I did get a "Service Engine Soon" lite one time before I removed and cleaned my MAF sensor. Mine had some excess oil from my KN air filter on it. A common problem.
DO NOT use brake cleaner on your MAF sensor. Get a spray can of CRC MAF CLEANER and carefully spray the tiny wires inside the MAF housing, then let it completely air dry.
Good luck
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Thread Starter
Intermediate
Joined: Sep 2010
Posts: 30
Likes: 1
Vette Missing
TY, I get a can at Checker next time I am near there.
Roy in Phoenix
Roy in Phoenix
You have to remove the MAF from the car, do not shake or jar it.....it's quite sensitive.
My car stumble upon low speed acceleration without any DIC messages etc., but I did get a "Service Engine Soon" lite one time before I removed and cleaned my MAF sensor. Mine had some excess oil from my KN air filter on it. A common problem.
DO NOT use brake cleaner on your MAF sensor. Get a spray can of CRC MAF CLEANER and carefully spray the tiny wires inside the MAF housing, then let it completely air dry.
Good luck
My car stumble upon low speed acceleration without any DIC messages etc., but I did get a "Service Engine Soon" lite one time before I removed and cleaned my MAF sensor. Mine had some excess oil from my KN air filter on it. A common problem.
DO NOT use brake cleaner on your MAF sensor. Get a spray can of CRC MAF CLEANER and carefully spray the tiny wires inside the MAF housing, then let it completely air dry.
Good luck
