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Rich cold start


monoloco38

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. I've been searching in the forum about rich cold start. I have a 1993 Cadillac deville 4.9 v8. I've done maintenance. full tune up. Plugs, wires, cap and rotor. New EGR, and new PCV valve. Throttle body cleaned and air intakes (those were bad) checked the timing yesterday (at 24 degrees) don't know why but I'll bring it down. Cold start rough... too much fuel. Runs perfect after warm. Any suggestions about the rich cold start? Any info it would be much appreciated. thank you. 

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I can't remember base timing on those with the aldl plugged in 6 degrees with the engine warm. Those balancers have a tendency to move spin a bit so you never know where you are timing wise. 

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Barzcy01.... seems like the balancer might be off. It's 2 inches off the 20 degree mark and the car runs fine warm. Computer says between 22 and 24 derees. All vacuum lines secured and checked. Good power when warm. It's just the cold start. Suggestions? 

Edited by monoloco38
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Oh good you got it fixed; thanks for posting what worked.  The part where you blew up the muffler sounds like it needs a longer story.

Bruce

2016 Cadillac ATS-V gray/black

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  • 2 weeks later...
  • 2 weeks later...

Glad you are making progress, sorry I didn't see your DM on 10/11, I didn't see it till today.  It sounds like your muffler was collapsed inside.  Odd that it would run better when warm though.

Did you put a new CAT in?   I had a CAT go bad, it wasn't clogged it just rattled loudly.   I had a clogged CAT on an 01 Monte Carlo, no power whatsoever, 01 was a bad year for CATs.

 

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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