Hi all,
Looking for some help here. Appologize in advance for the length of this post.
Car is my daughters car, and it ran OK, not great but Ok. She complained of a Chk Eng Light, so I went and picked it up. Sure enough it had a Chk Eng Lamp on, but after driving it for 20 miles on the freeway, I stopped to get gas, and at the next Key On, the lamp cleared.
About a week later, it came back. I drove to Autozone, and they pulled code. Had a O2 Sensor Fault.
I replaced the
O2 sensor and the code was cleared.
Then, the weird stuff started to happen.
When driving the car the next day, it stalled at the stop sign on my street. Started right up no problem, but it had a noticable hesitation, stumble and then stall. Creative throttle management could keep it running. Once it gets up to speed, it runs fine.
The next day, I noticed it again. Seemed to ONLY occur in Closed Loop (after warm-up). No codes or Chk Eng. Noting looks wrong, just stumbles and then stalls.
Took the car to a Firestone shop, it was a waste of time and $$$$. They found nothing and charged me $$ for the effort.
So I decided to dive in and do it my self.
I started by searching this forum... Lots of great advice for various items.
I decided to start by searching for a vacuum leak and then replacing the
IAC and Fuel Filter. Upon removal and inspection, both were in bad shape. I also cleaned the intake and throttle body with cleaner. No vacuum leaks were observed. All hoses looked good.
Note:: There is no PCV on this engine. I was surprised, but it has a hose to the case from the air intake box. I guess this is normal.
Car did seem to run better and I thought I nailed it. But nope. Did the same thing. Stumbles and stalls.
Next I replaced the
MAP, TPS and cleaned the MAF sensors. I used the throttle body cleaner from Autozone. It did a good job removing the gunk from the throttle body and internal parts. The MAF sensor is impossible to find around here. No idea why noone carries it. Any suggestions on where to buy one?
No help, same problem. Still stalls.
On Sunday, I plan to replace the
Fuel Pressure Regulator and order the
MAF ON-Line. I can post the results on Sunday after I do this.
So far I am
$500 into this and still has the same problem.
Note:::: The weird thing is, it did NOT do this before the O2 was replaced. But, with the fault, I can only assume it was in a default mode and not in closed loop. I have no idea how long the O2 had been bad as my daughter only recently mentioned it.
Anyway, I am looking for some help, ideas, tips or tricks. I am almost at my end with car. It is for sale and I hate to sell it in this condition.
Thanks again for all of your help in advance.
Dave