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1992 FD3S, 84k miles, unknown mileage on swapped motor.
Simple bolt ons(BOV, Intercooler, Intake, etc) with stock ECU(N3F1)
So I was on a nice breakfast date and embarrassing as it is, as we were just about to park, the motor just starts idling and hunting really low(300-600 rpm) and backfired a lot even with minor throttle. It started backfiring on the throttle and off the throttle. It was bellowing out white smoke which at first I thought blown motor. But I realized the white smoke was unburnt fuel and then noticed it was also smoking near the back of the motor and smelling of fuel inside the engine bay as well. I also was able to reach 6k rpm with ease if I was gentle with the throttle but would studder and backfire sometimes. I recently (within the past 2 weeks) changed my oil, put new plugs in, had a compression test done(F: 106,107, 109. R: 97, 98, 98). Also what seems strange is that most of my rotary friends said that a blown motor either doesnt want to start or takes many, many cranks to start. Mine still fires up the 3rd crank when cold and 1st crank when hot. It's been exactly the same ever since I got the car 11 months ago. I have also recalibrated the TPS and disconnected the MAP sensor while idling and it just shut off completely. At this point, I have inhaled way too much fumes of gasoline to continue working so any advice would help big time. It does sound like it has a gnarly Bridgeport and has 2 step. Hahaha.
Here is a picture of the spark plugs. Removed yesterday. And to clarify, there is no smell of coolant, I have never overheated and my coolant level is the same as it was 3 months ago.
Front rotor on top, rear rotor on bottom. Trailing on left, Leading on right.
Check the IAT sensor. When that fails or the connector come off the ECU thinks it's something like -30 degrees outside and enriches the fuel mixture. Better rich than lean (happened to me at the track).
Check the IAT sensor. When that fails or the connector come off the ECU thinks it's something like -30 degrees outside and enriches the fuel mixture. Better rich than lean (happened to me at the track).
Where is the IAT located and how would I be able to test if it is bad? Thank you for replying so quickly.
Another thing that comes to mind is the fuel pressure regulator. I had one stick on another car and the pressure got so high it sprayed fuel out the connections on the line. Very dangerous. It’s located below the UIM too, so another thing to check while you’re there.
Last edited by NV02; Nov 24, 2019 at 10:02 AM.
Reason: Clean up link
Another thing that comes to mind is the fuel pressure regulator. I had one stick on another car and the pressure got so high it sprayed fuel out the connections on the line. Very dangerous. It’s located below the UIM too, so another thing to check while you’re there.
Awesome!!! I'll check those and hopefully dont die from gas fumes!
