Thread: Part-throttle hesitation

thats the weird part, is i put a new one from advance in, i cant remember how many wires it was but it was fatter than the skinny one i had. I did this before i found out about the hestitation but was throwing a code for it

No, I am not convinced it is from the swap. It just happened around the same time. I am going to clean both the egr and BPT pipe tomorrow, and try to pressure test the system. Also I'll check from codes from the ECU.



I have never tuned my car. I just have the stock ECU and original DE in my car.



Unfortunately, I do not have a spare ECU around. I'll try some other things then scout one out if other things don't take care of it.



I can just disconnect the o2 sensor? Just follow the wires from the header and unclip the harness?

My new anti-theft device:



I pumped some air in it and built up some pressure, but didn't hear any leaks. Since I have already pulled off the BPT and EGR, I decided I'm going to buy several feet of that tubing and replace as many of the vacuum lines I can find. Once I get the car back together I will retest for leaks.

Onto the EGR and BPT. Thanks to Ben, I found this write-up:
Problems and Fixes

First off, when I clean the metal tube that goes to the BPT, I can just push all of the blockage into the area where the green arrow is, or should I try to take that piece off?



Here's my BPT valve:





It seems to be missing half the foam? I don't think that could cause a problem, could it? Should I clean this somehow while I have it off the car?

Here's both sides of the EGR bracket:





There seems to be some build-up there. Is it bad for 180,000 miles? What is the best way to clean all of that? Carb cleaner and wire brush? I scraped some of the bottom of the egr valve and it came off easily. Is the bottom the only part of the EGR that gets cleaned? I couldn't find a way to take apart the top of it. The se-r.net page assumes I know what I'm doing and isn't to explicit in the directions, but I obviously do not know what I'm doing.


Lastly, and completely unrelated, here is a pic of a bolt:



This bolt was used by the former owner to attach a seatbelt in the car and I have since used it for one of my racing harness attachment bolts. Recently I wondered if it is a grade 8 bolt or something else that is designed to be used to attach safety equipment. Is it a good one to use? Suggestions where I can get a proper one if it isn't?

In answer to your question, when you clean that EGR BPT tube, it's best to unbolt it from the intake manifold by removing those 2 bolts in your picture. Then disconnect it from your exhaust manifold/header also so that you can rotate the tube and peer inside up there where those 2 bolts are. At that point, the tube narrows down to a very small hole, and this is where you get clogged up. A dental mirror and dental pick make this job easier.

Problem solved. I wrote up what I did with pics in the first post.

Sweet!

^My car is jerking in the lower RPM's every now and then. I'll be changing the fuel filter, O2 sensor, spark plugs, and adding some gas treatment to see if that helps. These are my next things to do on my tune-up list. I triple checked all my vacuum lines and my MAF and TPS both have good readings. How do I check for a bad fpr? Also I just finished a swap so I'm in the tuning up stage, but the jerking/bucking in the lower RPM's get out of hand sometimes. It does it on and off.

1.) IACV - cleaned
2.) Air Regular - cleaned
3.) Spark plug wires/Cap/Rotor button - under 10k

P.S. Did you ground your O2 sensor to the block or intake manifold?