car bucking when cold and more!

[ekizenbe]

Hey guys here is the issue, when my car is cold she most of the time bucks when i'm trying to accelerate. Once she comes up to temp and i get into boost a little bit in first gear the boost comes online and the cars revs up but i feel like the finger of god is doing this it accelerates but very slow, once i pull second gear the hesistation goes away and the car pulls like normal. the car will do this maybe once or twice and then go away until she cools down overnight and i drive it the next morning. Also ever since i built the car when i take a very hard turn the car will actually cut all power and almost die and then come back. I cannot figure either of these problems out. I have brand new bpr7's gapped at .28. No boost leaks, a rebuilt tb. Im out of ideas.Once the car is driven for a bit all the first problem goes away, i don't know about the second one as i only turned hard enough for it to happen a few times but a friend had it happen to him on a hard turn as well. Anyone have any help??

 

[DSM_PWR]

this very simular thing happend to me while driving. it ended up being my alternator fuse. if you have a logger check your stats and also get your battery & alternator checked.

 

[tqmx1]

Replace your engine temp sensor on the base of your thermostat housing (the 2 spade termanal one) When it goes out it tells the ECU the engine is up to opperating temp.

 

[DSM_PWR]

yes however in some cases, if the temp sensor is out the car wont start. it will crank and turn over but not fire up. but i have seen some start up just not run good so i would get that checked.

 

[always_broken]

Replace your engine temp sensor on the base of your thermostat housing (the 2 spade termanal one) When it goes out it tells the ECU the engine is up to opperating temp.

Is this true?

 

[ekanddsm]

When the temp sensor goes out, it will tell the ecm that the car is trying to start at -40 degrees or somewhere it that are. So it injects too much fuel and floods out.

 

[DSM_PWR]

correct

happend to two of my friends, one just had to wiggle it around for it to work

 

[tqmx1]

The coolant temp sensor is a thermistor type unit. when the engine is cold (below 68F) it has a restance of 2.5 ohms telling the ECU it needs to be in the cold start mode =fuel enrechment. When the engine gets up to temp 168F or higher the restance drops down to .3 ohms telling the ECU to go to normal opperation.

If the sensor goes bad the ECU reverts to normal opperation so no cold start enrechment = bucking and farting when cold.

 

[always_broken]

The coolant temp sensor is a thermistor type unit. when the engine is cold (below 68F) it has a restance of 2.5 ohms telling the ECU it needs to be in the cold start mode =fuel enrechment. When the engine gets up to temp 168F or higher the restance drops down to .3 ohms telling the ECU to go to normal opperation.

If the sensor goes bad the ECU reverts to normal opperation so no cold start enrechment = bucking and farting when cold.

Good job. I'll go test that out with the voltmeter.

 

[tqmx1]

Good job. I'll go test that out with the voltmeter.

A ohm meter will work better . All the specs are listed in chapter 14 of the FSM