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49 Posts
Hi Guys,
When I first imported my R34 GTR in 2018 I noticed there was a slight hesitation on boost and the car struggled to start sometimes.
I replaced the battery, replaced the spark plugs and cleaned the MAF Sensors. At the time this seemed to solve the issue.
Recently the issue has returned and seems to be a lot worse.
Symptoms are as follows;
When unplugging the top rear MAF the car cuts out. When unplugging the front lower MAF the car continues to run and increases idle to approx 2000rpm. Switching the MAFs over and unplugging again does not change what happens when unplugging the MAFs. It is still the top rear one which stalls the car and the front lower MAF that the car continues to run when unplugged.
I have checked the voltage on both MAFs with them connected, both are getting a 12V supply and both return a signal to the ECU ranging from around 1v to 4v depending on throttle position while car is running.
I have also opened up the MAF sensors and the solder joints seem pristine.
Car has standard ECU (I believe?), also running Apexi Intakes, Decat and Tomei Ti exhaust.
Any idea's what else could be causing this? Any other checks I should carry out to diagnose?
Any help would be greatly appreciated.
Thanks
Liam
When I first imported my R34 GTR in 2018 I noticed there was a slight hesitation on boost and the car struggled to start sometimes.
I replaced the battery, replaced the spark plugs and cleaned the MAF Sensors. At the time this seemed to solve the issue.
Recently the issue has returned and seems to be a lot worse.
Symptoms are as follows;
- Struggles to start, sometimes have to tap the throttle to prevent stalling
- When cold there is a bad hesitation when i get to around 3000 rpm, can't rev any higher and car starts misfiring and backfiring from exhaust
- Has stalled when at traffic lights
- When warm struggles to start
- Strong smell of fuel and incredibly poor MPG
- Did the diagnostic check by bridging the pins on Consult Port, this gave Error Code 12 (Air Flow Meter)
When unplugging the top rear MAF the car cuts out. When unplugging the front lower MAF the car continues to run and increases idle to approx 2000rpm. Switching the MAFs over and unplugging again does not change what happens when unplugging the MAFs. It is still the top rear one which stalls the car and the front lower MAF that the car continues to run when unplugged.
I have checked the voltage on both MAFs with them connected, both are getting a 12V supply and both return a signal to the ECU ranging from around 1v to 4v depending on throttle position while car is running.
I have also opened up the MAF sensors and the solder joints seem pristine.
Car has standard ECU (I believe?), also running Apexi Intakes, Decat and Tomei Ti exhaust.
Any idea's what else could be causing this? Any other checks I should carry out to diagnose?
Any help would be greatly appreciated.
Thanks
Liam