HELP Engine Light w Many Codes

[Fnred98]

Replaced Coil Pack #4 and #5, this resolved the CEL and the car is running so much better.
1. Should i replace the other 4 coil packs ?
2. It seems like there is some hesitation which I believe could be a semi blocked Cat Converter. Will take some Temp Readings within the next few days to answer that questions. Has anyone here replaced there Cat with a Cat By Pass, which unit did you use and did the CEL come on?

Thanks for all your replies.

[blue62]

Originally Posted by Fnred98

Replaced Coil Pack #4 and #5, this resolved the CEL and the car is running so much better.
1. Should i replace the other 4 coil packs ?
2. It seems like there is some hesitation which I believe could be a semi blocked Cat Converter. Will take some Temp Readings within the next few days to answer that questions. Has anyone here replaced there Cat with a Cat By Pass, which unit did you use and did the CEL come on?

Thanks for all your replies.

You can also use a vacuum gauge to check for a restricted Cat Converter or restricted exhaust.
I am surprised at how many people don't have a vacuum test gauge in there tool box.
A very basic tool that can tell you many things about your engines condition.

[Gilles]

Originally Posted by blue62

You can also use a vacuum gauge to check for a restricted Cat Converter or restricted exhaust.
I am surprised at how many people don't have a vacuum test gauge in there tool box.
A very basic tool that can tell you many things about your engines condition.

Blue, could you please provide more details on how do you test a restricted cat using a vacuum gauge?

I bot a digital manometer (JFP's suggestion) to check the vacuum on the block and curious how you use it to check a congested cat.. thanks!

[blue62]

Originally Posted by Gilles

Blue, could you please provide more details on how do you test a restricted cat using a vacuum gauge?

I bot a digital manometer (JFP's suggestion) to check the vacuum on the block and curious how you use it to check a congested cat.. thanks!

A digital manometer is different then a standard (old school) vacuum gauge.
So it will not work to check a restricted exhaust system.

With a standard vacuum gauge its the action of the needle on the gauge that is important.
So you do a "Snap throttle test" and a "Hold RPM test".
Cats have to be hot Ect. Ect.

It will be easier for me, and probably more informative for you if you google vacuum gauge testing catalytic converters.
You will find all the info you need to do the test.

Edit: A standard vacuum gauge only costs around $15.00-$20.00 and as I stated in my other post very handy tool.
There is lots of info on using them on the net just have to search around.