'94 Explorer Intermittent Stall
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'94 Explorer Intermittent Stall
'94 Exp V6 4X 110K
Slow on the quick accelleration, but drives about town fine. On the freeway however the check engine light will come on and go off. Engine will cut out (I will be accellerating and it will act as though I took my foot off the pedal). If I keep my foot on the gas or push down, nothing will happen. I have to take my foot off the gas for a few seconds then when I push down it will run fine for awhile (maybe a mile). It really acts up when I am going up hill. I checked the codes and it showed a problem with the oxygen sensors so I replaced them, it also has a new throttle positioning sensor. I just had a tune up to see if that would help. I no longer have any codes, but the problem remains.
For an Intermittent check engine light it sure happens a lot! Any Ideas?
Paul
Slow on the quick accelleration, but drives about town fine. On the freeway however the check engine light will come on and go off. Engine will cut out (I will be accellerating and it will act as though I took my foot off the pedal). If I keep my foot on the gas or push down, nothing will happen. I have to take my foot off the gas for a few seconds then when I push down it will run fine for awhile (maybe a mile). It really acts up when I am going up hill. I checked the codes and it showed a problem with the oxygen sensors so I replaced them, it also has a new throttle positioning sensor. I just had a tune up to see if that would help. I no longer have any codes, but the problem remains.
For an Intermittent check engine light it sure happens a lot! Any Ideas?
Paul
Last edited by Sleepy Paul; Jul 22, 2003 at 10:52 PM.
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'94 Explorer Intermittent Stall
A new fuel filter was installed when I had a tune up. So that shouldn't be the problem. I have been running injector cleaner with premium gas as well. I'll check the fuel pressure, I'm leaning toward either a bad injector or fuel pump.
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'94 Explorer Intermittent Stall
O.K.
I checked the fuel pressure and it measured 30 psi with the vac. hose attached and 40psi without the vac. hose.
I also have codes again:
172 - Heated Oxygen sensor indicates lean condition on right side.
176 - Heated Oxygen sensor indicates lean condition on left side.
181 - Adaptive fuel rich limit reached at part throttle, right side.
186 - Injector pulse width higher than expected.
I drive 80 miles round trip each day. Yesterday I didn't have any problems except one power drop. Today it started up again. I'm also leaking transmission fluid (threw a wrench on those pan bolts). Wonder what's next?
I checked the fuel pressure and it measured 30 psi with the vac. hose attached and 40psi without the vac. hose.
I also have codes again:
172 - Heated Oxygen sensor indicates lean condition on right side.
176 - Heated Oxygen sensor indicates lean condition on left side.
181 - Adaptive fuel rich limit reached at part throttle, right side.
186 - Injector pulse width higher than expected.
I drive 80 miles round trip each day. Yesterday I didn't have any problems except one power drop. Today it started up again. I'm also leaking transmission fluid (threw a wrench on those pan bolts). Wonder what's next?
Postmaster
Joined: Dec 2001
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'94 Explorer Intermittent Stall
Are those continuous memory or KOER? Since you've replaced the O2 sensors before, I don't think the sensors are bad. The fuel pressure looks normal, did you do an acceleration test while you had the fuel pressure gauge attached (rev the engine and see if the fuel pressure stays within a couple of pounds of the value at idle)? Inspect the wiring carefully and make sure the O2 sensors are grounded. Sometimes I've heard of a problem like this being caused by a bad engine to chassis ground.
If you want to approach this systematically, get a hold of the "circuit pinpoint tests" from a good manual (I go to the library and look them up in Mitchell). There you'll also be able to get good wiring diagrams to help find the real culprit.
Good luck and let us know what you find.
If you want to approach this systematically, get a hold of the "circuit pinpoint tests" from a good manual (I go to the library and look them up in Mitchell). There you'll also be able to get good wiring diagrams to help find the real culprit.
Good luck and let us know what you find.
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'94 Explorer Intermittent Stall
have you ever had the injectors cleaned if not i would have them cleaned also this , what is the status of your air filter. but i would recomend resseting the computer
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'94 Explorer Intermittent Stall
The codes indicate lean condition on BOTH banks (sides) of the engine that the computer can no longer compensate for by increasing the injector pulse timing length. Based on what you have checked in the fuel pressure delivery area, you have either partially blocked injectors on both sides, or additional air in the intake system that is not accounted for. Bad injectors on both sides , while a possibility, is not likely. My guess is that you may have the famous leaking lower intake gasket problem. If you pull the lower intake to replace the gasket, you can inspect/clean the lower end of the injectors at the same time by squirting them down with carb cleaner to remove deposits from the lower surface. If you also have pinging associated with your problem, it reinforces the leaking gaskets. I assume you have already ruled out the MAF and looked for disconnected vacum hoses. Also check power brake booster for diaphram leakage. Another possible source for additional air is partially stuck open EGR valve, but you show no EGR realted codes.
Dialtone
Dialtone
Last edited by Dialtone; Jul 26, 2003 at 02:30 PM.
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