Hey everyone! I have a 91 supra that used to be an auto, now currently a 5speed swap out of an 89. I was putting my car back together after an APEXI S-VAC was ripped right off the ecu. Some of the wires were left hanging(stupid of me), wasnt quite paying attention but I slapped my injectors back in and put everything back together and the car was running fine. I take the car down the road and all of a sudden it starts spitting and sputtering. My father accidentally kicked the wires and brushed them across the ecu. I manage to get the car back home and try to figure out whats going on. A fuel pump upgrade to a walbro 255, a new TPS, and a different fuel relay, I still cannot get the car to fire. The TPS was the last part I changed. Before I did the car sat and idled just fine but when you applied throttle it would try to cut out. Checked for codes and it showed for a bad TPS. I buy a brand new one, change it out, and it fired idled for two seconds and then died. Rolled the car over again, fired, idled for two seconds and died again. I thought maybe I had the adjustment off so I advanced the TPS and tried again. This time it only rolled over. Since then its not fired since. I know it has fuel but for some reason I have no spark anymore. There is power to the coil but nothing coming out of it. Any ideas? Sorry there was a story before my question. Figured more information the better. Thanks!
Changed TPS and now i've lost spark?....
- Thread starter DerekT
- Start date
Does the MIL come on with the key? If so the TPS can't be involved. Check the coil pack wiring and other stuff in that area you may have disturbed.
ifyouaint1sturlast
Banned Scammer - I'm whitemike.
JJ, is your logic that if the MIL doesn't illuminate, the computer is not getting power? In that case, check fuses after repairing the wiring ..
There's only one failure mode of the TPS or its wiring that can prevent spark and it can be verified as not being present by the MIL coming on. That said the ECU will still have power should the failure occur. I seriously doubt any of this is his problem though.
ifyouaint1sturlast
Banned Scammer - I'm whitemike.
jetjock;1848224 said:
I see.. I do as well, I'm sticking with my simple and easy-to-check diagnosis. I'm thinking the wires shorted and blew a fuse.
When it fired after I put the new TPS on the check engine light came on. When it did the car shut off. It did the same thing again when it fired for the second time. After I advanced the TPS and tried rolling it over again and it failed i noticed the check engine light wasn't on anymore. I tried forcing it into diagnostic mode after it didn't fire and I didnt get anything. Nor did I get a check engine light when I just turned the key forward right before ignition. I'm confused to why is my light gone, where did my spark go that I just had, and what happened to it just throwing a TPS code when it was just running fine the day before.
I'm not surprised. May want to check for ECU power. If powered check for sensor Vc because no Vc = no workie...
Also... The CEL is a light bulb and they DO burn out... Unless none of the lights are coming up in which case it's less likely.