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08-11-2007, 11:46 PM | #1 | |
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1978 Revcon Motorhome (GMC)
I have a 1978 Revcon Motorhome (same as the GMC motorhomes) with an Olds 403 engine. It failed smog this time with a high HC level (3800 should have been <300) at idle. Hi RPM passed great. I changed the plugs, Cap, Rotor, and wires. Sounds like it is still missing on one cylinder on the right bank. Compression is good on all 8 cylinders. Any help on the cause for high HC's and how to lower it would be appreciated.
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08-12-2007, 09:28 AM | #2 | |
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Re: 1978 Revcon Motorhome (GMC)
Pinpoint that miss this is your high HC problem.
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08-14-2007, 07:16 PM | #3 | |
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Re: 1978 Revcon Motorhome (GMC)
Maxwedge...Thanks...those were my thoughts too...but wasn't sure of what to look for for a high Hydrocarbon condition
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