RPMs bogging down during hard acceleration, Help Plz!!

[Pooters]

Def clutch

[wsmeyer]

I feel like I'm listening to people trying to convince someone the world is flat.

Anyone who thinks that a clutch slipping will cause engine rpm's to drop clearly has no idea what they are talking about.

William.

[danewilson77]

I feel like I'm listening to people trying to convince someone the world is flat.

Anyone who thinks that a clutch slipping will cause engine rpm's to drop clearly has no idea what they are talking about.

William.

You're right.

Actually, this is kind of what my car was doing when the fuel pump went out. I wonder if checking fuel pressure at the fuel rail is warranted.

And FYI...the world is flat...it's just rolled around a magma core...hehe

[Hornung418]

I feel like I'm listening to people trying to convince someone the world is flat.

Anyone who thinks that a clutch slipping will cause engine rpm's to drop clearly has no idea what they are talking about.

William.

Well instead of telling us that we're wrong, why don't you tell us what is happening in the video? Your arrogence is appalling regarding this situation. You know what it's not...but how does that better the OPs problem? It's not working for me and I can sense a little disdain from others.

No further questions, Your Honor.

RootedDROIDXstatus. Come at me, bro.

[wsmeyer]

You're right.

Actually, this is kind of what my car was doing when the fuel pump went out. I wonder if checking fuel pressure at the fuel rail is warranted.

And FYI...the world is flat...it's just rolled around a magma core...hehe

Certainly a possibility. The problem with trying to diagnose engine problems is the symptom might be caused by the computer compensating for a completely different problem. Since he mentioned aftermarket headers I'll throw out a possibility. If he has an exhaust leak upstream of the O2 sensor when he lets off the gas it will cause a drop in exhaust pressure which could easily suck in some outside air making the computer think the engine is running lean, pump some more fuel in there to compensate and wala.. engine bog.

Kind of a stretch but probably the only thing I would look for before getting an error read out.

William.

[bcleaver]

I don't know what it is, but I think it is still helpful to remove things it's not through the process of elimination. So to help the OP I think it's reasonable to let him make an informed decision about what to replace based on what it may or may not be.

I agree it is not the clutch slipping. Any non-engagement of the clutch either through the clutch being bad, or a faulty/slow CDV engagement would result in HIGHER rpm's between shifts, not lower. Anyone that has ever had a clutch go out on them can relate...you stomp the gas and your revs go up, but your car does not go any faster...the power transfer between the engine and the tranny doesn't exist, or is diminished so all that power just goes to spinning the flywheel.

It is also unlikely to be the traction control system, only in that he's getting it shifting into higher gears. The stock power from these cars isn't enough to cause rear tire slippage above 3rd gear in a straight line.

It's possible the ECU is pulling timing because it thinks it's running rich or lean because of the faulty o2 sensor or somthing. I would guess it's something along those lines, but really don't know.

Keep us posted though when you figure it out, and good luck.

[Pooters]

I've replaced the clutch in my 240sx and Toyota Pickup because they were doing the same thing. Clutch not holding on at higher RPM's in between shifts and gradually grabbing. Once a clutch is almost all the way out it wouldn't bog down at all and instead go up in RPM's.

[az3579]

It's possible the ECU is pulling timing because it thinks it's running rich or lean because of the faulty o2 sensor or somthing. I would guess it's something along those lines, but really don't know.

Keep us posted though when you figure it out, and good luck.

Regarding the headers, the OP mentioned he has eBay headers and a resulting O2 sensor code. While that code may have been on since he replaced the headers, it is possible that the O2 sensor has gone bad since then. He wouldn't know it though because he's used to the SES light being on. OP, have you read the codes after this started happening to see what's what? Has anything new other than the O2 sensors come up?

How many miles on the O2 sensor? They typically need to be replaced every 100k otherwise you may 1) get worse fuel mileage, 2) run too rich or lean, or 3) throw codes. In your case, 1, 2, or both may be possible. 3 you wouldn't know because you already have codes from the headers.

[VA//M3]

OP, have you ever replaced your crank sensor?

[kayger12]

I feel like I'm listening to people trying to convince someone the world is flat.

Anyone who thinks that a clutch slipping will cause engine rpm's to drop clearly has no idea what they are talking about.

William.

Please check your PMs.

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