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My wife's 2003 mitsubishi outlander loses power when I hit

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the gas hard to pass...
My wife's 2003 mitsubishi outlander loses power when I hit the gas hard to pass and sometimes backfires. I replaced the throttle position sensor, but now it is still doing it.
Submitted: 2 years ago.Category: Mitsubishi
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Answered in 5 minutes by:
7/29/2015
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Doug
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8,624
Experience: Mitsubishi employed and Factory trained ASE certified technician
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Hi,
Is the Service Engine Soon light turning on, either all the time or even just when the problem occurs?
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Customer reply replied 2 years ago
sometimes when the problem occurs.
Customer reply replied 2 years ago
Hello?
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Thanks.
Sorry for the delay. Are you able to get the system scanned (most auto parts stores will do this for free) close after the problem occurs so we can see what fault(s) set?
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Customer reply replied 2 years ago
I had it scanned, but the service engine light was off at the time and they read nothing.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
I understand.
What is the history of the timing belt, had it been done within a reasonable time frame (They are due every 60k)?
If you run the engine at night and rev the engine some, so you see any red glowing from the exhaust (under hood or beneath the car)?
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Customer reply replied 2 years ago
I replaced the timing belt 10,000 miles ago and had no problem. I believe if it was the timing belt it wouldn't be a intermittent problem.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Thanks, ***** ***** not realize the problem came and went.
How about the exhaust glowing in the dark when revving?
And can we induce the engine light so we can scan it again and see why it was turning on?
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Customer reply replied 2 years ago
Glowing on the inside? What would that elude to? The light is on right now. I induced it when I replaced the TPS and stompped on the gas and it lost power and backfired, but when slowly pressing on the gas it revs up fine.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
The glowing would be either on the manifold or under the vehicle (roughly around the center console area or at the bend toward the muffler). These would indicate a restriction in the exhaust if you saw glowing.
This is probably already been looked at since you were doing a TPS, but there aren't any tears in the intake duct between the throttle and the air filter is there? Cracks/baffles missing/etc?
If you unhook the MAF (right behind the air filter, the big square sensor) will the engine run acceptably, and if so is the problem more or less identical when you stomp on it?
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Customer reply replied 2 years ago
No tears, no wire quality issue. When I pull the MAF it actually revs up when I stomp on it, slower then it should, but it don't try to stall out like when it is plugged in.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Hmm.
Looking in the MAF opening, do you see any signs of fuzz or filter material, or any black/soot like gunk in there? Paying particular attention to the pillar like portion in the center.
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Customer reply replied 2 years ago
I was away on work. I pulled and inspected, it is clean no soot, looks good.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Thanks. What is the condition when the MAF is unplugged?
Have you set any codes since last we spoke?
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Customer reply replied 2 years ago
It seems to not want to stall when it is un-plugged, but it doesn't rev up fast. the only code was P0122 which is a TPS. I replaced that already.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Is the tps fault still present after the tps was replaced?
Do you have a live data scan tool so we can see what that sensor is doing if so?
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Customer reply replied 2 years ago
yes the tps code is still present and no i don't have a scan tool.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Hmm. It is pretty hard to discount that fault considering how closely related it is to your symptoms.
Do you have a multi meter? If so, let's unplug the sensor and test for voltage with the key on at each wire and let me know what you see there.
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Customer reply replied 2 years ago
Which sensor. I tested the TPS with a multi meter. I got the 5v from computer and when gas is pushed voltage rises. Also I confirmed it had a good ground.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
The tps, please unplug the sensor and check voltage with key on, not plugged in. Let me know what your source voltages are.
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Customer reply replied 2 years ago
What is a tos sensor? If you ment TPS. It is receiving 5v on one terminal.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
TPS. The spell check refuses to acknowledge those letters, so I have to go back and change them each time I post. You must have caught it in the 10 seconds before I changed it.
Please plug the sensor back in and then back probe the 5V wire. Tell me what the voltage is at rest, then the voltage fully opened.
Finally, slowly open the throttle and watch the voltage, is it linear movement?
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Customer reply replied 2 years ago
As stated before I got 5v from the computer. On the other wire which tells the computer what the throttle position is, I get 0v to 5v as it is turned depending on how much it turns. It is linear in movement.
Customer reply replied 2 years ago
It peaks at a little over 5v full throttle.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
You get 0V when closed? Is that exact?
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Customer reply replied 2 years ago
.39v
Customer reply replied 2 years ago
Its .39v at idol to a little over 5v at full throttle.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Thanks.
Please loosen the TPS and adjust it so you are at 0.700V when fully closed. Then clear the fault and see if the P0122 returns or not.
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Customer reply replied 2 years ago
The closest I can get it is .71v. The light is still on. I can clear the code, but the code only returns on occasion any ways. It seems to be running better now. Its still idoling a little low about 600 RPM.
Customer reply replied 2 years ago
I was unaware of needing to adjust the TPS sensor.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Thanks.
At this point the only thing I would try before getting it to a shop for a full inspection would be trying a different tps sensor -if the new one was aftermarket-. Mitsubishi and aftermarket electronics do not get along, so this could be a plausible scenario, add it would certainly be far from the first time something like this has happened.
The fault you are getting is literally saying that the voltage for the tps is dropping out. It only sets if the computer sees near zero voltage (0.2v or less).
We know the 5v source is good, and we know the fixed ground is good (as it is shared with the other sensors on the car), which would leave us (again the sensor being ruled out, which if aftermarket we can't exactly do at this point) with either a wire issue between the computer and the sensor on the sensing wire or a problem with the computer itself.
Neither of these are terribly common at all, however an inspection with a full scan tool could help rule the wiring out. If the scan tool sees the same voltage at rest you are seeing on the meter and no dead spots in travel, then you would know the wiring is intact as well. This would only leave the computer itself or again the sensor if it is feeding noise back on the wire or similar scenario like we see with low quality electronics.
If you can not get to a shop with access to a scan tool to test this condition, then I would suggest checking your exposed wiring around the sensor area for signs of damage, and again if the sensor is aftermarket trying a genuine one (even if used) before going further. A computer issue is highly unlikely. Just remember to set the new sensor like we did (0.650-0.720v roughly at closed position).
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Customer reply replied 2 years ago
This is the first weekend I have had to work on the car again. It is still doing the same thing. I have the TPS set right, yet the car is still having a rough idle and back fire and it wont rev up without dying.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 2 years ago
Yeah with that ruled out it is going to be time to get it to a professional with proper scan tool that can log the engine management and see what is out of place.
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