Cant rev pass 3500 rpm HELP

Chuck33079 · 10-24-2012, 06:49 PM

I'm not sure if the Z's ecu works the same way, but on other cars I've been able to see pending codes on an OBD scanner even if the check engine light isn't on. Might be worth a shot before you spend eternity troubleshooting. Or, clear the ecu and assume it's a random one-off glitch unless it comes back. If it's a real issue, it'll happen again.

wind.zero · 10-24-2012, 07:37 PM

Quote:

Originally Posted by Chuck33079

I'm not sure if the Z's ecu works the same way, but on other cars I've been able to see pending codes on an OBD scanner even if the check engine light isn't on. Might be worth a shot before you spend eternity troubleshooting. Or, clear the ecu and assume it's a random one-off glitch unless it comes back. If it's a real issue, it'll happen again.

^^
This

Find out if you have a code that is not throwing the CEL. I had this and it was a small adjustment in my tune but your description is almost exactly what was happening to me. It was definitely limp mode. A restart of the car, or several restarts, usually fixed it.

My problem tracked backed to a MAP issue in the tune. Did you wash or detail the engine recently? The paste below was the troubleshooting path I followed:

It is probably worth a shot to the check the MAP sensors:
1) Harness or connectors
2) Mass air flow sensor
3) MAP sensor
4) Evap pressure sensor
5) Intake air leaks
6) Intake air temperature sensor

Good luck. Limp mode sucks.

tru_Asiatik · 10-24-2012, 07:44 PM

Quote:

Originally Posted by wind.zero

^^
This

Find out if you have a code that is not throwing the CEL. I had this and it was a small adjustment in my tune but your description is almost exactly what was happening to me. It was definitely limp mode. A restart of the car, or several restarts, usually fixed it.

My problem tracked backed to a MAP issue in the tune. Did you wash or detail the engine recently? The paste below was the troubleshooting path I followed:

It is probably worth a shot to the check the MAP sensors:
1) Harness or connectors
2) Mass air flow sensor
3) MAP sensor
4) Evap pressure sensor
5) Intake air leaks
6) Intake air temperature sensor

Good luck. Limp mode sucks.

MAF also crossed my mind as i havent cleaned it as of late...

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10-24-2012, 06:49 PM	#1 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29540	I'm not sure if the Z's ecu works the same way, but on other cars I've been able to see pending codes on an OBD scanner even if the check engine light isn't on. Might be worth a shot before you spend eternity troubleshooting. Or, clear the ecu and assume it's a random one-off glitch unless it comes back. If it's a real issue, it'll happen again.