High idle when slow driving

[bigbluechevy]

I am going to be putting a new exhaust on my truck also and was wondering if anyone would give me an idea on the best catalytic converter to use on my truck I would like to have the most free flowing exhaust as I can.Thanks.

 

[350runner]

Magnaflow makes some real good cats.

 

[chengny]

If I am reading the stats on your truck correctly (1987 V30 with a 454), you don't even need catalytic converters. Your exhaust - as originally from the factory - is sweet.

Just two straight pipes (2 1/2") with a muffler inserted in each run:

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BTW- That OEM muffler is getting extremely hard to find.

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They are made of highly corrosion resistant steel and will easily last for 20+ years - as is the OEM exhaust piping. Here is what my factory mufflers looked like after 29 years:

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They were still good, but I am doing a restore so I replaced them with an NOS set (found one @ $329 and the other one @ $189). Took me a few months of looking around to get those prices.


White Racing has 3 remaining (about $400 each):

MUFFLER EXHAUST

USD $395.68

Add to Cart:

Add to Cart
Part #: 15529620
Shipping Weight: 17.8lbs
3 Units in Stock
Manufactured by: GM

http://www.whiteracingproducts.com/index.php?main_page=product_info&cPath=67348&products_id=1615385

 

[bigbluechevy]

I live in Virginia and it has to have a cat.I have been checking out everything and this idling problem is how I found that my cat. was stopped up.What Magnaflow should I be looking for I am looking for the best flow I can get and I am planning on using a Flowmaster 50 series muffler I just want a good sound not to loud but enough to know it is flowing good and get the max pulling power out of it.Thanks.

 

[350runner]

nothing special in ordering them long as they fit the pipe in your exhaust system it'll work just fine. putting on a cat of any kind will quite down a exhaust system.

Sent from the dust in front of you!

 

[chengny]

Oh I see, you've got an "N" engine - never mind.

 

[89Suburban]

I am going to be putting a new exhaust on my truck also and was wondering if anyone would give me an idea on the best catalytic converter to use on my truck I would like to have the most free flowing exhaust as I can.Thanks.

I run one of these on my truck and it runs fine and passes the sniffer test and is only 40 bucks.

https://www.rockauto.com/catalog/moreinfo.php?pk=1317381&jnid=43&jpid=0

Also be sure to break it in properly!

http://www.rockauto.com/info/EasternCat/Converter Break In flyer.pdf

 

[bigbluechevy]

I have still been working on my idle problem and found something today it has the wrong PROM in the computer.Would anyone know where I can get one I have the GM part # to get crossed if needed.Thanks,Joey.

 

[bigbluechevy]

I was wondering if anyone has done the test light test on the IAC and how does it work I was wanting to check mine out but I don't know what I am looking for I saw it somewere but it didn't give much info.I also am looking for info on how the AIR system is suppose to work I think mine is not working right its pumping air while idling and cuts off when you give it throttle.Thanks,Joey.