jgscott
New Member
- Messages
- 67
- Location
- Atlanta GA
I need help. I have a 97 SC400. I pulled my stock motor to do a complete perfromce engine build up.
The problem I am having is with a different used 97 SC400 1UZFE motor that I bought used, and, installed while I build my original motor.
The used motor had 101k miles on it and was from a wrecked car. I checked the service history and it was serviced good. I installed it and used my existing ECU which plugged up fine.
The motor runs hot as indicated by the in dash temp guage. After 5 mins of idleing the dash temp guage shows the needle peaked way past the H ( hot), The motor then starts to skip and miss and throws a CEL. The CEL read Misfire on just about all clyinder, Bankl 1, and says too rich. Here's what I have checked, and done so far.
- Re bled and flushed the coolant system for air about 3-4 times.
- Changed the thermosat & ran with no thermostat.
- Changed the top mounted, front temp sending unit.
- Checked the fan, and flushed the fluid in the fan pump system.
Today we took a independant digital temp guage sending unit, and put it in the coolant at the sending unit openning, and bleed valve openning. The bleed valve coolant temp was about 160 degrees, and the temp sensor opening coolant read 170 degrees. Someone told me the thermostat was set to open at 210 degrees, so even tho it shows hot, I don't think it is really that hot as the dash indicator says.
The car will throw a CEL light and the start running like crap when it starts showing a reading in the dash temp of above H ( hot ).
I thought about if that used motor could have a blown head gasket, but if that was causing it to go hot. I would think that the coolant temp reading I took would show temps way above 170 degrees and I saw no evidence of water on the dipstick.
One other strange thing is that when I pull the oil dipstick when I shut the car off after it shows HOT, I hear a hiss of pressure release from the dipstick tube.
Anybody know what it could be ? Is there a second sensor that could be bad that is fooling the dash tempature reading and then thus fooling the ECU and confusing it to think that it was HOt ? Thanks.
The problem I am having is with a different used 97 SC400 1UZFE motor that I bought used, and, installed while I build my original motor.
The used motor had 101k miles on it and was from a wrecked car. I checked the service history and it was serviced good. I installed it and used my existing ECU which plugged up fine.
The motor runs hot as indicated by the in dash temp guage. After 5 mins of idleing the dash temp guage shows the needle peaked way past the H ( hot), The motor then starts to skip and miss and throws a CEL. The CEL read Misfire on just about all clyinder, Bankl 1, and says too rich. Here's what I have checked, and done so far.
- Re bled and flushed the coolant system for air about 3-4 times.
- Changed the thermosat & ran with no thermostat.
- Changed the top mounted, front temp sending unit.
- Checked the fan, and flushed the fluid in the fan pump system.
Today we took a independant digital temp guage sending unit, and put it in the coolant at the sending unit openning, and bleed valve openning. The bleed valve coolant temp was about 160 degrees, and the temp sensor opening coolant read 170 degrees. Someone told me the thermostat was set to open at 210 degrees, so even tho it shows hot, I don't think it is really that hot as the dash indicator says.
The car will throw a CEL light and the start running like crap when it starts showing a reading in the dash temp of above H ( hot ).
I thought about if that used motor could have a blown head gasket, but if that was causing it to go hot. I would think that the coolant temp reading I took would show temps way above 170 degrees and I saw no evidence of water on the dipstick.
One other strange thing is that when I pull the oil dipstick when I shut the car off after it shows HOT, I hear a hiss of pressure release from the dipstick tube.
Anybody know what it could be ? Is there a second sensor that could be bad that is fooling the dash tempature reading and then thus fooling the ECU and confusing it to think that it was HOt ? Thanks.