Stalling from light after long highway driving w/cruise control

[slick3d]

Hi everyone, it seems that after driving on the highway for about an hour or more at 75 mph with cruise control on, when I exit and come to a stop, then give it gas to go the engine bogs down or stalls. If I back off the gas then it gets past that or if it stalls i just restart and it runs fine. Any ideas or suggestions? It doesn't do that any other time.
It's a 98 Explorer XLT 4.0 v6 SOHC
Thank you for any help
Dennis

 

[EB4X]

Could be fuel pump going out....do fuel pressure test. No CEL ?

 

[Fix4Dirt]

Could be fuel pump going out....do fuel pressure test. No CEL ?

+1 on this one.

OP if you try to pass on the highway does it do that to?

 

[slick3d]

+1 on this one.

OP if you try to pass on the highway does it do that to?

No problem passing, but a couple of times I found the revs didn't respond right away and I had to really step on the gas pedal hard for it to respond, not often but it has happened.

 

[slick3d]

+1 on this one.

OP if you try to pass on the highway does it do tha

Could be fuel pump going out....do fuel pressure test. No CEL ?

Replaced fuel pump and fuel filter at 110k, it's got 167k now.

I have notice that it only happens when I'm on the highway for over an hr on cruise control, get off an exit with a stop sign, just stop and go that's when it bogs down and sometimes dies. I throw it in park, crank it and starts right away

 

[XLTrunner]

My '98 SOHC has stumbled like this every once in a great while for years (never stalled, though). There have been threads on this, but nobody seems to know exactly what causes it. Suppose it could have something to do with the fuel pump, but I'm not convinced as it runs very well otherwise.

 

[slick3d]

Could be fuel pump going out....do fuel pressure test. No CEL ?

No check engine light, no codes

 

[slick3d]

My '98 SOHC has stumbled like this every once in a great while for years (never stalled, though). There have been threads on this, but nobody seems to know exactly what causes it. Suppose it could have something to do with the fuel pump, but I'm not convinced as it runs very well otherwise.

Same here, can't figure it. The other day was the first time that it stalled, usually it just stumbles as if it's going to die but if I don't press the pedal to hard it recovers then it's fine.

 

[slick3d]

Same here, can't figure it. The other day was the first time that it stalled, usually it just stumbles as if it's going to die but if I don't press the pedal to hard it recovers then it's fine.

I was thinking heat saturation but I'm on the highway doing 75 or 80, I can see that if I was in stop and go traffic. New spark plugs and wires at 137k, air filter at 123k

 

[Fix4Dirt]

My '98 SOHC has stumbled like this every once in a great while for years (never stalled, though). There have been threads on this, but nobody seems to know exactly what causes it. Suppose it could have something to do with the fuel pump, but I'm not convinced as it runs very well otherwise.

oh! mine used to do that, but then once i changed the IAC and TPS pigtails I havent seen it again... could it have been those? who knows... some gremlin that will reappear? maybe! but its been about 6mo and its never come back... perhaps try checking the wiring on that since it seemed like every so often it short and then it would fall on its face if i didnt give it some gas

I was thinking heat saturation but I'm on the highway doing 75 or 80, I can see that if I was in stop and go traffic. New spark plugs and wires at 137k, air filter at 123k

have you tried seeing fuel pressure around when these rhings happen?

No problem passing, but a couple of times I found the revs didn't respond right away and I had to really step on the gas pedal hard for it to respond, not often but it has happened.

hmmm ok mine does the same so idk on that one

 

[slick3d]

oh! mine used to do that, but then once i changed the IAC and TPS pigtails I havent seen it again... could it have been those? who knows... some gremlin that will reappear? maybe! but its been about 6mo and its never come back... perhaps try checking the wiring on that since it seemed like every so often it short and then it would fall on its face if i didnt give it some gas

have you tried seeing fuel pressure around when these rhings happen?


hmmm ok mine does the same so idk on that one

I will check the wiring, checking the fuel pressure would be next. I wonder if the TPS could be causing the problem?

 

[slick3d]

I will check the wiring, checking the fuel pressure would be next. I wonder if the TPS could be causing the problem?

Would a TPS that is going bad throw codes?

 

[Fix4Dirt]

I will check the wiring, checking the fuel pressure would be next. I wonder if the TPS could be causing the problem?

it could possibly. however many people fault the TPS for thigns it's not. id test it to see... but every once in a while when its hot out (as in high desert 100+ degree days) if you try to pull out from a light somewhat quickly it'd fall flat on its face. but since the new IAC and TPS pigtails its been fine. it may just be coincidence (last year and this year so far arent as hot as usual here)

Would a TPS that is going bad throw codes?

it can throw a code.

 

[slick3d]

it could possibly. however many people fault the TPS for thigns it's not. id test it to see... but every once in a while when its hot out (as in high desert 100+ degree days) if you try to pull out from a light somewhat quickly it'd fall flat on its face. but since the new IAC and TPS pigtails its been fine. it may just be coincidence (last year and this year so far arent as hot as usual here)

it can throw a code.

 

[slick3d]

Ok, thank you for the feedback. I will check my throttle body as well, maybe it's gotten dirty. I wonder if the TPS is getting confused after being on the highway for long period of time under cruise control then coming to a quick stop and then having to go from a stop sign, it's not responding fast enough? I'm not sure....

 

[J_C]

I could be wrong but was under the impression that the TPS has double resistive elements such that if it is going bad, the two won't be in sync and will throw a code.

I'd start by checking fuel trims with a scan tool showing live data, and temperatures, and check fuel pressure, and clean the IAC valve. If it only does this after getting hot, it could take a while to nail down the problem. I'd also try it with the A/C off and check your pulleys since that is easy to do.

 

[slick3d]

Ok, thank you for the feedback. I will check my throttle body as well, maybe it's gotten dirty. I wonder if the TPS is getting confused after being on the highway for long period of time under cruise control then coming to a quick stop and then having to go from a stop sign, it's not responding fast enough? I'm not sure....

Your gas pedal is really an air pedal, by pressing on the pedal you're basically opening the throttle up for more air to come in, the TPS then sends the signal for the computer to send more gas. If at that moment the TPS is not fast enough then you basically have a lean situation and the motor would want to stall.

 

[slick3d]

I could be wrong but was under the impression that the TPS has double resistive elements such that if it is going bad, the two won't be in sync and will throw a code.

I'd start by checking fuel trims with a scan tool showing live data, and temperatures, and check fuel pressure, and clean the IAC valve. If it only does this after getting hot, it could take a while to nail down the problem. I'd also try it with the A/C off and check your pulleys since that is easy to do.

I will do that, thank you. Any any OBDII scanner would work? Even if it's the ones that connects to your phone?

 

[J_C]

Your gas pedal is really an air pedal, by pressing on the pedal you're basically opening the throttle up for more air to come in, the TPS then sends the signal for the computer to send more gas. If at that moment the TPS is not fast enough then you basically have a lean situation and the motor would want to stall.

How could it not be fast enough? I suppose it could be intermittent contact but otherwise, electrons move near the speed of light.

 

[J_C]

I will do that, thank you. Any any OBDII scanner would work? Even if it's the ones that connects to your phone?

It would have to be a scan tool specifically capable of live data. The cheap ones only claiming OBD2 code reading won't work. Yes, the ELM327 based dongles that connect to your phone, especially using an app like Forscan, will work.