well my car runs great until it goes into closed loop. My temp guage goes to hot even when i havent run the car all day. Do you tink that these two things are related. I tried replacing the sender where the rear heater hose is and that didnt change the temp guage. Also it is an N/a to a tii swap. Any advice. the car when it goes into closed loop it acclerates very slowley and dosent want to go anywhere.

 

If the gauge is pegging when the car goes into closed loop.. the ECU is somehow getting a signal that the car is running super hot and going into "safe" mode where its dumping extra fuel in.

First... hook up and aftermarket water temp gauge like an electrical autometer, and make sure that your temperature ISNT skyrocketing for some reason...

Then... recheck all your wiring.. it seems like something is backfeeding the o2 voltage to ECU's water temp section.....

 

Are you getting a "check" light?

 

unplug the o2 sensor. doesn't do much anyway.

 

Usually if your accelerating the engine goes out of closed loop. In fact most every time.

 

How do you even know you're in closed loop? Are you watching an A/F gauge? I think you're using the wrong term here. Closed-loop only occurs at very low engine loads, and never during acceleration. It seem very unlikely that this is EFI-related. Even if the mixtures were screwed up you'd never create enough extra heat to make the engine overheat. Are you sure your cooling system is up to scratch? Exacly what driving conditions cause this?

 

*********Any advice. the car when it goes into closed loop it acclerates very slowley and dosent want to go anywhere**********

It could be the timing is sooooooooo retarded that it is overheating the engine. Check it with a timing light. Any simple, cheap timing light from the local auto store will do.

When you say the gauge goes all the way to HOT, do you mean it pegs out????????

IF the engine isn't puking it's guts out into the overflow, then I'd say install a aftermarket gauge temporarily SOMEWHERE in the cooling system to see what the real temperatures are.

 

well the guage pegs even when i havent run the car all day. I go out and turn the car to run but not running and the guage pegs WTF. Very weird. have a different cluster mabey i will try that? What do you guys think. I got and aftermarket guage but cant hook it up anywhere. Where do all of you hook it up at?

 

the temp sender is grounding out. Whether because it's not plugged in or the wires fkd who knows. It's not your gauge.

 

its not grounded because i checked it it is the actual guage itself. So i am just going to hook up my electric water temp guage to the sender. But whey then do you think that the car runs good till it gets warmed up. I am racking my brain. Been working on it for like 2 weeks every day and am about to kill my self over it. AHHHHHHH

 

Like he said above, you water temp senders wire is touching a ground/block somewhere.

For just checking the REAL water temp, and not a permanent installation you could cut the upper radiator hose in two and install a pipe with a bung on it that fits whatever aftermarket gauge you have. That requires being able to install a bung in the pipe. I've done this in the past and used a propane torch and plumbing solder. It's on a daily driver I have. It's not pretty but it does not leak and is just for seeing what the real temp is.

On another car I removed the auxillary fan temp sensor and drilled the guts out and tapped the right thread size in the gutted out portion and installed a Autometer temp gauge.

On another car the thermostat housing had NO hole for a auxillary fan temp sensor but the boss was there so I just drilled a hole and installed a Autometer sensor.

But you don't have a problem except you need to approach your car and pull the temp sensors wire off where it's touching ground and install it on the water temp sensor. It's just fwd of the oil pressure sender. Small in size. One wire connector that might be broken off.

I've no idea what year car you have, turbo or non turbo or if someone has previously installed a combination meter off another series car. Lotta unknowns out there.

 

the wire is not grounded i checked it with a continuity test and a ohm test. I am just going to hook up an electric autometer to the sender. It works already checked

 

it's got nothing to do with your gauge. you can take your gauge out and your car will still run like crap because the ecu thinks it's ridiculously hot. The wire is grounding somewhere, or maybe the sensor is stuffed, I'm not sure if it would produce the same reaction or not. Cut the wire at the ecu end and see if anything improves is one suggestion.

 

ok i will try that. Couldent i just pull the pin out of the conecter and test with a dmm and see if it grounded?