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Engine Surge Please Help

94mazdab4000

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Location
Grass Valley, Ca
Vehicle Year
1994
Make / Model
Mazda B4000
Transmission
Manual
Hello all, I'm new here. I have a Mazda B4000 4.0 OHV with a manual transmission.

I'm having surging issues. It lags (has loss of power) until the accelerator is all the way to the floor. I was throwing multiple codes. But have cleared everything up except for code 172. These are the things I've done.

1. New MAF (had code stating it had irregular
voltage)

2. Replaced upper and lower intake manifold gaskets. This got rid of the 176 or 177 code.

3. New IAT sensor or what ever it's called that measures the intake temp.

4. New plugs, wires and coil pack.

5. New fuel filter.

6. Double core alluminum radiator and thermostat, flushed and put zerex in.

7. Checked for air leaks, replaced pcv line and gromit that goes into the brake booster and replaced all other lines so there for sure is no leak.

I've done alot to this truck including a new transmission and clutch. I can't figure out for the life of me what's going on. It's OBD1 so I'm kind of limited by the data on the code reader I have.

The only thing I can think of is that it's a fuel problem and is either faulty injectors or a slowly dying fuel pump. The oil pressure seems really low by the gauge but I don't know of it's works by or no t it stays in one place and does not move.


Any input would be greatly appreciated. Thank you God bless and stay safe out there.
 


Colin

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Transmission
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2WD / 4WD
2WD
Have you tried cleaning the idle air control valve yet? My old truck was having some idling issues and that valve was all gummed up and sticking. And you checked the engine for vacuum leaks? Spray brake clean all around and see if the engine reacts
 

adsm08

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Transmission
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2WD / 4WD
4WD
Tire Size
31X10.50X15
First two things I'd check are fuel pressure and then check the TPS for a dead spot.

Fuel pressure when the engine is revved should decrease only slightly, and with a healthy pump and regulator may even go up a bit.
 

Colin

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2WD / 4WD
2WD
Adsm08 is a very knowledgeable dude so definitely try this
 

Brown_Eminence

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Location
conyers, GA
Vehicle Year
1994
Make / Model
mazda b4000
Transmission
Automatic
Hello all, I'm new here. I have a Mazda B4000 4.0 OHV with a manual transmission.

I'm having surging issues. It lags (has loss of power) until the accelerator is all the way to the floor. I was throwing multiple codes. But have cleared everything up except for code 172. These are the things I've done.

1. New MAF (had code stating it had irregular
voltage)

2. Replaced upper and lower intake manifold gaskets. This got rid of the 176 or 177 code.

3. New IAT sensor or what ever it's called that measures the intake temp.

4. New plugs, wires and coil pack.

5. New fuel filter.

6. Double core alluminum radiator and thermostat, flushed and put zerex in.

7. Checked for air leaks, replaced pcv line and gromit that goes into the brake booster and replaced all other lines so there for sure is no leak.

I've done alot to this truck including a new transmission and clutch. I can't figure out for the life of me what's going on. It's OBD1 so I'm kind of limited by the data on the code reader I have.

The only thing I can think of is that it's a fuel problem and is either faulty injectors or a slowly dying fuel pump. The oil pressure seems really low by the gauge but I don't know of it's works by or no t it stays in one place and does not move.


Any input would be greatly appreciated. Thank you God bless and stay safe out there.
do you or are you still having these issues?
 

94mazdab4000

New Member
Joined
Apr 14, 2020
Messages
20
Reaction score
1
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Location
Grass Valley, Ca
Vehicle Year
1994
Make / Model
Mazda B4000
Transmission
Manual
New IAC valve, new TPS, have checked for leaks, replaced upper and lower intake Man fold gaskets, just changed the fuel pump. The only thing left I'm thinking is the PCM (computer) but yeah it still has lag and surges only at full throttle..
 

Guanfy

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Messages
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Location
Crawfordville, Florida
Vehicle Year
1994
Make / Model
Mazda B3000
Engine Type
3.0 V6
Transmission
Manual
2WD / 4WD
2WD
Total Lift
Stock
Total Drop
Stock
Tire Size
15in
Did you have these issues from the beginning or after something happened/part swapped?
 

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