Well, all my bragging and boasting has come back and bit me.

Tonight my girl and I took it out for a back roads drive and about 25 min. into the trip the car threw a CEL and began acting weird. I was driving the car up some pretty good hills and it was pulling great. Then I pulled out onto a main road and when I got to about 30 mph, on a flat stretch, the engine started acting quite odd. My power of the motor seemed to be about only 50% and the motor was firing enough to cause a vibration. I am throwing a #10 (IAT) once again. As I mentioned before, from having the plugs crossed it literally melted the tip of my IAT. I noticed this the other day when I put a used 1 in. When I originally put it in the tip was smooth and round.

The car also idles very oddly. It stays very high (2K rpm for the first 3-4 min on a cold start up. Then the idle drops to normal, but if I push the gas it dips to normal then goes up to 1100 rpm, then goes down slow to 800 rpm.

My main concern is did I fry something in the ECU? I have read some other threads about people frying a part of their ECU by crossing them as I did. I am going to replace the sensor tomorrow and see what happens I guess.

 

I can't tell if you bought another one. Those things are dirt cheap. You can also pull one from the junkyard. It's not often I heard of one going bad.

About your ecu, you could take the covers off and see if anything looks burnt.

 

You say there's evidence of damage - like a melted tip? That overrides anything I said about the sensor being OK. I missed that part on the earlier posts (getting to be a pretty long thread).

 

Ok today I installed a new IAT sensor and the CEL went off.

The problem I am having now is when I am actually driving the car, in "Drive". When I go to start out using light throttle, the car stutters until I reach about 25 or give it more gas. Then the stuttering quits and the car runs perfectly. As a test, I unplugged the TPS sensor and the low throttle stuttering stopped.

What is also odd is this stuttering, even with the TPS hooked up, doesnt do it when the car is in park and I touch the throttle.

This is the 2nd TB and TPS (both from junk yard) that I installed. Both do the same thing unless I unplug them. At this point I need to test the voltage coming out of the TPS. Is it common for the TPS sensor to fail? Seems odd 2 in a row are duds...

 

Specifically the car does the stuttering at 2100 rpm. Under and over 2100 it runs just fine. Doesn't miss a beat.

 

Is it possible to not throw a CEL even if my TPS is bad/going bad?

 

Isn't stumbling at a certain RPM range a symptom of EGR problem? I'm just not sure what range of RPM that happens.

I think the CEL for TPS is either too-high or too-low. It probably doesn't have any way to know if the reading is within range but INCORRECT for throttle position.

 

I went out tonight and was able to pull some codes even though the CEL isn't on. See the video below for the CEL's. I am a little confused on what codes these are. Can you help?

 

I read a 7 and 21. But I'm old and slow.

Clear the codes. Check the ground cable.....battery, then where it connects to the body and then where is conncets to the trans. Be sure all points of contact are clean and tight.

Then the main ground (G101) for the ECU is on the end of the, TB....same drill, clean and tight.

Check the oil level also.

Restart and see what you get.

 

So a bad ground could cause this weird hesitation at a certain RPM? I will be honest and upfront and tell you that the lead ground wire coming off the battery bolt onto the tranny is in horrific condition. It is frayed beyond belieft and only looks to be held in by less than half the wire itself on the bolt on the tranny.