One thing leads to another...engine code, then coil packs, then anti fouler, now

[Dragnfly Racing]

One thing leads to another...engine code, then coil packs, then anti fouler, now low idle and it hunts.

I am trying to sell this car and I realize that the anti fouler is a patch, but I need to sell this car soon.

So I had the coil pack issue causing it to buck etc. Then it popped a code for the pre-cat. So after changing the packs, wires, plugs etc and adding the anti fouler to the 2nd 02 sensor, now I have another issue.

The car hunts for idle and almost stalls after pulling up to a red light. It drops to almost 200 rpm, then bounces up to about 750 after you tap the throttle.

I cleaned the EGR about 6 months ago, so I doubt it is that.

Any other ideas?

 

[tweety2300]

Check the intake tube for cracks

 

[Dragnfly Racing]

Replaced it last month.

 

[CheeseHelmet]

It sounds like an EGR problem. 6 months is a long time if your EGR was marginal to begin with.

 

[rsvinylgraphics]

cleaned the MAFS lately?

 

[Dragnfly Racing]

The EGR looked like new when I cleaned it last time. I haven't cleaned the MAFS since last year, but when I did, it looked good.

After reflecting on this, I started thinking about this issue. If this thing sits for a few weeks, it will smoke a little on start up. I have thought the pcv valve may be stuck, but it rattles when you shake it. I may change it, just for good measures.

I have wondered about the IAC and the EGR both, but those are both quite costly. I don't want to throw parts at it if I can avoid it.

 

[rsvinylgraphics]

I would clean it again and reset the ECU by disconnecting the battery for a few minutes. It is worth a shot in my opinion.

 

[Dragnfly Racing]

I reset it today after installing the antifouler. I am wondering if I remove it (antifouler) and see if the problem goes away.

 

[tweety2300]

If the rpms are bouncing after you reset the ecu its just re adjusting and there is no problem last time I did it it took 150 miles before it was done other times it was 40 give it a few days and see if it stops

 

[Dragnfly Racing]

Cool, thanks.

I just cleaned the intake system with the seafoam spray. It seems better, we'll see what happens. I have driven it approx. 20-25 miles so far.