idle/stall issue fixed, now a flat spot on acceleration

[no694terry]

i still vote O2 sensors mainly because they kick in at higher throttle, like the amount of throttle you need to be hitting that 3250 rpm in a rover on a regular basis. i pretty sure they only throw codes if they are outside there normal volt range, so they could be reading wrong but not detectable enough to throw a code, i think.

 

[cosmic88]

i still vote O2 sensors mainly because they kick in at higher throttle, like the amount of throttle you need to be hitting that 3250 rpm in a rover on a regular basis. i pretty sure they only throw codes if they are outside there normal volt range, so they could be reading wrong but not detectable enough to throw a code, i think.

?? The O2's are constantly telling the ECM the most current state of mix...once warmed up anyway. If the ECM is in closed loop then the O2's are commanding mixture.

 

[no694terry]

after some further reading i just learned that O2 sensors and MAF sensors are ignored at WOT so i dont know what to say, all my years of thinking have just been turned upside down. i always thought it was the opposite.

 

[cosmic88]

That's nothin'... I just learned when my wife tells my 18 mo old daughter " Go see Daddy..." it means my daughter is bringing me a Pamper full of shit.

And she wonders why I'm in the garage...... :ack:

 

[nursemcdonald]

BUMP. Any closure on this issue?

 

[msggunny]

BUMP. Any closure on this issue?

Nope, still doing it.

 

[AKDisco]

Have you checked your fuel pressure? I had the same issue on my '95 D1. Mine started off where it would only do it at high RPM and under load...but eventually got to the point where I could barely get the vehicle out of my neighborhood (which is mostly flat and level). My fuel pressure gauge would drop to 15 psi whenever the engine would bog down and it turned out to be a faulty fuel pump.

 

[msggunny]

I have checked the fuel pressure, driven around with a fp gauge taped to the window so i could watch it. No fluctuations that would lead me to believe that the fuel pump is failing at all.

 

[msggunny]

Update.

Truck sit for 2+ weeks, took it to the grocery store after making sure it was warmed up. Ran fine, like a raped ape (or as close to a raped ape that a 4.0 5speed can duplicate)

No flat spots, no issues.

Just plain weird.

 

[RoverbyProxy]

It needed a time out, at least until you are ready to go on a long trip to the next off road event.