Author |
Message |
Michael Wittwer
TryHard South Australia TT with HKS T3Gs, R154 and a Torsen making 300rwkw and pov pack V8
Posts: 366 Reg: 09-2010
| Hi All, Need some help, I have a v8 uzz31 with an issue once the car is warmed up. When I start the car, everything is fine, put the car into drive / reverse no issue. When the car has warmed up, it idles fine in park / neutral, but when I put it into drive the revs drop to about 500 rpm and the car sounds like it is going to stall and will not move under its own power. I have had the ECU refurbished, new plugs, igniters, leads, distributors, drained the fuel tank and put fresh fuel in. I thought it could have been a trans issue, but its fine when cold in drive or reverse. I need some help guys if anyone has any ideas. Thanks in advance |
Tom Richards
Goo Roo nsw V8
Posts: 2324 Reg: 08-2005
| coil near the AC compressor |
Michael Wittwer
TryHard South Australia TT with HKS T3Gs, R154 and a Torsen making 300rwkw and pov pack V8
Posts: 367 Reg: 09-2010
| Sorry I should have added that to list, I have replaced both coil packs, could there be a problem with the connector? The other thought I had could it be a fuel supply problem / bad sensor due to it only being a problem when it is warm? |
Brett Harrison
DieHard QLD JZZ30
Posts: 967 Reg: 09-2005
| Michael, disconnect the plug on the Air flow meter and tell me what it does once warm. Also have you replaced the ecu temp sensor, green one. |
Michael Wittwer
TryHard South Australia TT with HKS T3Gs, R154 and a Torsen making 300rwkw and pov pack V8
Posts: 368 Reg: 09-2010
| I have disconnect the airflow meter, made no difference, haven't replaced the ecu temp sensor. |
Michael Wittwer
TryHard South Australia TT with HKS T3Gs, R154 and a Torsen making 300rwkw and pov pack V8
Posts: 369 Reg: 09-2010
| Turns out the refurbished ECU was faulty, had a spare one and no issue. |
Roland Elliott
TryHard New South Wales uzz32 1uz-fe
Posts: 286 Reg: 08-2014
| Seems to be a lot of so called Re-furbished ECU's failing , I have heard of 3 just this week, wonder who claims these are re-furbished when they obviously are not, otherwise they should last at least 20 years + . |
Ilya Ali
Tinkerer Brunei Muara V8
Posts: 15 Reg: 11-2014
| or it could've been something else that went bad that wasn't replaced during the refurb? |
Roland Elliott
TryHard New South Wales uzz32 1uz-fe
Posts: 287 Reg: 08-2014
| From my experience with them nothing else goes wrong. |
Mike Beck
Goo Roo New Zealand 3UZ-FE V8 4.3 UZZ32
Posts: 6175 Reg: 11-2005
| Likely some residual leakage hiding in the ECU under parts that's spread around and contaminated other circuits. Had that happened to a couple I've fixed a while back, learned what to watch out for. |
Roland Elliott
TryHard New South Wales uzz32 1uz-fe
Posts: 291 Reg: 08-2014
| I always clean mine with Isopropyl and crc contact cleaner, then bake in oven for 30 min or so at low temp. spotless and less all contaminations and moisture. Then I run them up loaded while looking over them with infra temp scope to find any hot spots that should not be there, this also finds any bad solder joints. |
Mike Beck
Goo Roo New Zealand 3UZ-FE V8 4.3 UZZ32
Posts: 6177 Reg: 11-2005
| Oven baked. Sounds like a delicacy! |
Nathan Roberts
Tinkerer Victoria V8
Posts: 7 Reg: 09-2017
| Hi Michael, It's the ECU. 99% sure. Had same problems before mine died about 7 months later. Certain 'experts' are not using the correct capacitors when refurbishing ECU's, causing them to fail in weeks, or just never work. |