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Engine Cutting Out Randomly

heycharger

By heycharger,
in General Maintenance

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heycharger Apprentice

heycharger

Posted
Posted

Hi all, I recently picked up a pretty worked R33 s2. Always been into Valiants/Chargers so this is a little different. :down:

The car has been great but in the last 250km's or so it's developed a problem that seems to occur the more I drive it. At random times when driving, whether running low or high boost, whether the car has been running 5 minutes or an hour, the throttle simply dies. It feels like I've taken my foot off the accelerator pedal; it just looses throttle. Then 1~3 seconds later it kicks back in. Then dies again. etc. It mainly happens driving around town (low RPM), but has occurred on the highway too. Additionally a couple of times when I've started the car up it hasn't idled as high as it usually does and even after warming up for a few minutes it conks out when reversing out. I don't thrash the car (much...) and have only had it happen when doing normal driving, IIRC.

I checked the Power FC hand controller and when this occurs the InjDuty momentarily hits 0% (or otherwise decreases significantly) and IgnTiming drops significantly too (i.e. ~50% down?). The other stats on the 8-way readout appear normal. The throttle 'dropouts' only occur for a split second or couple of seconds then it's fine, then a couple/few seconds later happens again. Usually the problem disappears a minute or two later but it happened yesterday intermittently for about 20 minutes and today seems to be hanging around and showing it's head every 10 minutes for a minute. When the problem happens, there's sometimes (but not always?) a clicking at top of engine; unsure if related (only noticed that this morning once when I had the bonnet up, then it went away).

BTW car was recently tuned and runs very hard 95% of the time without ANY problems whatsoever, so I guess it can't be the tune. Knock is still very low (usually 1~10; hasn't changed since this problem started) and I'm strictly running BP Ultimate 98.

EFI/turbo's are new to me and I feel a little lost...what am I dealing with here?

Any help would be GREATLY appreciated.

heycharger

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-Jimmy- Mentor

-Jimmy-

Posted
Posted

Very nicely explained, I'm having the same problem on my RB25DE NA... Got no idea what it is or how to test it? Some people say it could be a dodgey AFM but I have sprayed the sensor inside with carby cleaner as suggested, and resoldered all the joints tightly.

wht510 Experienced

wht510

Posted
Posted

The best way of telling whether you have a problem is to plug the car into a laptop with diagnostic software (I bought some diagnostic software = "Nissan Data Scan" for my SR20DET for $40. You need a plug as well to plug into the OBDII plug on the ECU. which is under $100.

THEN you can find all the problems with the motor and see if all the sensors are ok! Easy!

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