Help! 1st Time Removing Plenum....now rough idle

[batchman]

Hi Max,

You may get more response if you bring up an old post with a similar problem to what ever you are facing, or a new post on that issue.

I don't know the code #s but have had ABS faults due to loose wheel hubs, which can happen when you run hard on modern performance tires. Probably worth checking by jacking the car up and shaking each wheel (left/right and up/down), any more than just a little play (both directions) indicates it's time to replace. It usually takes a lot of play before ABS has trouble though.

Hope that helps,
- Jeff

[jon_d4]

Thanks for the responses, guys.

Originally Posted by Dynomite

MAP vacuum


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I checked the vacuum line from the MAP sensor to the plenum. I removed it, reinstalled, made sure it was tight, then ran the car again. No change. Thoughts?

[jon_d4]

Originally Posted by Dynomite

MAP vacuum


Sent from my iPhone using ZR-1 Net Registry

Nailed it. Thanks!

[2ljd]

Thanks for the checklist. While some of the items would be nice to do, they'll have to wait a bit.

The purpose of my plenum pull was to change out the injectors and trace a secondary vacuum leak. While I was in there, I changed out the plugs, wires and coils for good measure. I traced the vacuum leak to the solenoid and replaced it. The secondaries worked perfectly after that.

Everything went back together smoothly enough, but upon startup, it felt as though it was running on only half the cylinders. That was last night...tonight, I pulled the plugs to inspect them and only one of them looked slightly discolored (probably didn't run them long enough to affect them).

Then I started the engine again and began to pull each plug wire one by one to see if the idle changed at all. Well, it appears that cylinders 2, 5 and 8 didn't change the idle when I pulled the wires. I know they were all getting spark because it was jumping to the heads.

So I need to pull the plenum and check each injector for resistance as well as for spray, and make sure I pushed the connectors on all the way. If they check out, I'm dreading having to trace back from there...