RB20 dies when warm. PLEASE HELP - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

smellslikerubber · 04-03-2014, 12:05 PM

im almost positive that my MAF is good. im gonna get an 02 sensor in the next few days just to try it.

knock sensor? what is that and where is it located
(im a huge noob to all of this

)

also could anyone provide information how how to test CAS? ive done some searching to find it, but have not come up with any good quality instructions on how to do so.

also last night i tried plugging in the extra ECU i have. car wouldn't ever start. just cranked. im very tempted to buy another ECU and plug it in because everyday im leaning closer and closer to my problem being related to the ECU. any suggestions on doing this?

Nissanrb25240sx · 04-03-2014, 01:30 PM

Quote:

Originally Posted by smellslikerubber

im almost positive that my MAF is good. im gonna get an 02 sensor in the next few days just to try it.

knock sensor? what is that and where is it located
(im a huge noob to all of this

)

also could anyone provide information how how to test CAS? ive done some searching to find it, but have not come up with any good quality instructions on how to do so.

also last night i tried plugging in the extra ECU i have. car wouldn't ever start. just cranked. im very tempted to buy another ECU and plug it in because everyday im leaning closer and closer to my problem being related to the ECU. any suggestions on doing this?

Knock Sensors are underneath the intake manifold, one towards back of the engine and one more center, that's how it is on my rb25. Should be the same

stilettoman · 04-03-2014, 02:44 PM

I installed an RB20DET in my 84 RX-7 about two years ago. After a few weeks, it began to have some strange behavior, similar to what is described here, but not exactly the same. In my case, the engine will shut off, just like turning off the key, but comes back after two or three seconds. This would happen before I get out of my driveway, still cold, or it may not happen until I drive for an hour - definitely not temperature related. A few times it will just quit, but if I switch the key off and back on it resumes normal running. Occasionally I will drive for miles, run errands and it runs perfectly. I get about 28 MPG in all around driving, over 30 highway.
I have swapped in four different throttle position sensors, three cam position sensors, one MAF, two ignition modules, and one ECU. None of these have made any difference. Most of the time it runs perfectly. The O2 sensor or the temp sensor could cause rich or lean running, but should not shut off the computer. When mine cuts out, it does not stumble, comes back on smoothly, just like I turned off the key and back on. This tells me that both the ignition and the fuel are being shut off. The only code I have ever gotten is TPS.
I suspect there is a bad connection somewhere in the wiring or possibly internal to one of the connectors, and an intermittent connection is causing loss of some signal which confuses the ECU.
Details of my swap are given here:
http://www.rx7club.com/nw-rx-7-forum...roject-982785/

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04-03-2014, 12:05 PM	#1
smellslikerubber Join Date: Jan 2014 Location: St.Louis Age: 32 Posts: 24 Trader Rating: (0) Feedback Score: 0 reviews	im almost positive that my MAF is good. im gonna get an 02 sensor in the next few days just to try it. knock sensor? what is that and where is it located (im a huge noob to all of this ) also could anyone provide information how how to test CAS? ive done some searching to find it, but have not come up with any good quality instructions on how to do so. also last night i tried plugging in the extra ECU i have. car wouldn't ever start. just cranked. im very tempted to buy another ECU and plug it in because everyday im leaning closer and closer to my problem being related to the ECU. any suggestions on doing this?

04-03-2014, 02:44 PM	#3
stilettoman Join Date: Apr 2014 Location: carnation, washington Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	I installed an RB20DET in my 84 RX-7 about two years ago. After a few weeks, it began to have some strange behavior, similar to what is described here, but not exactly the same. In my case, the engine will shut off, just like turning off the key, but comes back after two or three seconds. This would happen before I get out of my driveway, still cold, or it may not happen until I drive for an hour - definitely not temperature related. A few times it will just quit, but if I switch the key off and back on it resumes normal running. Occasionally I will drive for miles, run errands and it runs perfectly. I get about 28 MPG in all around driving, over 30 highway. I have swapped in four different throttle position sensors, three cam position sensors, one MAF, two ignition modules, and one ECU. None of these have made any difference. Most of the time it runs perfectly. The O2 sensor or the temp sensor could cause rich or lean running, but should not shut off the computer. When mine cuts out, it does not stumble, comes back on smoothly, just like I turned off the key and back on. This tells me that both the ignition and the fuel are being shut off. The only code I have ever gotten is TPS. I suspect there is a bad connection somewhere in the wiring or possibly internal to one of the connectors, and an intermittent connection is causing loss of some signal which confuses the ECU. Details of my swap are given here: http://www.rx7club.com/nw-rx-7-forum...roject-982785/