Snailed
New Member
If a pictures says a thousand words, what about a video.
But for those who want to read. It's a 92 vx hatch with a JDM OBD1 DOHC ZC. Mods are ebay i/h and magnaflow exhaust along with a 255 walbro.
The problem:
The car randomly runs extremely lean. I say random cause the problems are very random and hard to catch on video. For the most part the car runs good with plenty of power and very smooth. It has 2 problems, one of which didn't show in the video. The one that showed in the video started about 1 month ago. Everything will be fine and then it decides to slowly lean out until it hits 22.4 afr and then quickly jumps back to 14.7. It will do this idling and driving. It does it more often in warmer weather if it matters. While it leans out the car will lose power and run rough almost to the point of stalling then quickly return to normal just before it stalls.
Problem #2 which didn't show is similar but fast. It jumps 15 to 22.4 to 15 with in a couple of seconds. When it hits 22.4 the car decels like a semi truck jake brake. This afr switching causes an annoying somewhat violent bucking sensation. This problem start last year summer. This problem only happens at part throttle and not accelerating.
I'm lost as to what it can be. I replaced the fuel pump, fuel filter, O2, Rebuild Distributor.
PLEASE HELP
But for those who want to read. It's a 92 vx hatch with a JDM OBD1 DOHC ZC. Mods are ebay i/h and magnaflow exhaust along with a 255 walbro.
The problem:
The car randomly runs extremely lean. I say random cause the problems are very random and hard to catch on video. For the most part the car runs good with plenty of power and very smooth. It has 2 problems, one of which didn't show in the video. The one that showed in the video started about 1 month ago. Everything will be fine and then it decides to slowly lean out until it hits 22.4 afr and then quickly jumps back to 14.7. It will do this idling and driving. It does it more often in warmer weather if it matters. While it leans out the car will lose power and run rough almost to the point of stalling then quickly return to normal just before it stalls.
Problem #2 which didn't show is similar but fast. It jumps 15 to 22.4 to 15 with in a couple of seconds. When it hits 22.4 the car decels like a semi truck jake brake. This afr switching causes an annoying somewhat violent bucking sensation. This problem start last year summer. This problem only happens at part throttle and not accelerating.
I'm lost as to what it can be. I replaced the fuel pump, fuel filter, O2, Rebuild Distributor.
PLEASE HELP
