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Re: [GMCnet] EFI vs Carb [message #326053 is a reply to message #326033] Wed, 15 November 2017 21:02 Go to previous messageGo to previous message
GMC Jimmy is currently offline  GMC Jimmy   Canada
Messages: 199
Registered: September 2016
Location: Niagara, Ontario
Karma:
Senior Member
Thanks Jim and to the others that responded, I guess I'm just as confused by the decision to go with EFI over a properly tuned carb and which system to go with (if I decide to go with fuel injection), as many others are.

My issue began while on a trip to northern Ontario a couple of months ago. 1975 26' Royale by Coachmen,I left and the coach was running fine, temperature was around 75 degrees. A couple of hours into my drive I decided to stop for fuel, when I pulled into the service center the coach began running rough, idle was off and for the first time the coach stalled. After fuelling up it started fine but was clearly not running smooth, once on the highway it appeared to be running fine until I stopped again.

I let it cool down and after a few hours I fired it up and same issue. Next day same thing. Once I arrived home I noticed that the black soot left from the tail pipe suggested it was running rich. Replaced plugs, gapped at 54, wires, cap and rotor along with new air filter and fuel filters and it started and ran beautifully for a short run of ten minutes, then it started running rough again.

Replaced the coil and ignition module, installed a fresh set of plugs with a gap of 60, set the timing, fired right up and idled smooth for a few minutes then started acting up again, almost as though when getting to temp caused the idle issue. At this stage decided to do a compression check, everything was excellent except number 2 had ZERO compression, determined to be exhaust valve, seat jumped out.

Now I'm ready to have the heads and intake reinstalled after a valve job with everything new and carb cleaned out, at this stage trying to decide which way to go regarding EFI. I will do some research on the EBL system and will get in touch with Dick Paterson.

I would like to drive the coach out to California in the spring and obviously hoping for a reliable set up. Any additional opinions are welcome especially those which are based on experience with a particular system.

All the best,
Mike

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