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Old 01-06-2007, 03:25 PM   #1
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I started getting an intermittent "service Engine soon" light on my 93 Itasca 454 Chev chassis. Migage went from 9 down to 5 and black carbon buildup in exhaust pipe. I had a guy with a diagnostic computer come out. Supposedly a certified mechanic. None of us can find the diag plug to find out whats wrong. Any ideas?
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Old 01-06-2007, 03:25 PM   #2
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I started getting an intermittent "service Engine soon" light on my 93 Itasca 454 Chev chassis. Migage went from 9 down to 5 and black carbon buildup in exhaust pipe. I had a guy with a diagnostic computer come out. Supposedly a certified mechanic. None of us can find the diag plug to find out whats wrong. Any ideas?
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Old 01-07-2007, 01:12 AM   #3
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Steve Day 51:
I started getting an intermittent "service Engine soon" light on my 93 Itasca 454 Chev chassis. Migage went from 9 down to 5 and black carbon buildup in exhaust pipe. I had a guy with a diagnostic computer come out. Supposedly a certified mechanic. None of us can find the diag plug to find out whats wrong. Any ideas? </div></BLOCKQUOTE>

I beleive that the OBDII port didn't come out until 1996. Yours probably has the old style port. The OBDII specification also includes the basic location for the port to make it easier to find to the right of the brake pedal while the old port may be anywhere under the dash or even in the engine compartment.

A truck mechanic who actually has experience servicing the P30 Motorhome chassis should have no problem finding the connector or diagnosing the problem.
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Old 01-07-2007, 04:39 AM   #4
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Steve, welcome to iRV2.com. Winnebago should be able to tell you exactly where the connection is. We are glad to have you join us and hope that you will be an active participan on the forum. Let us know what you find out. Thank you. Good luck and take care.
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Old 01-15-2007, 07:00 AM   #5
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I always just disconnect the negative cable in the battery for 10 minutes , then reattached it back and see if that correct the CHECK ENGINE LIGHT. It seems to work all the time for me. Then just run higher octane and replace the air filter and pour a bottle of fuel injector with the fill up of gas use higher octane to clean out the jets and also exhaust pipe. Might have to do it a couple of times , you are cleaning out the system and need the computor to reset and also make use the AIR SENSOR on your air intake to your carb is plug in. VERY IMPORTANT.
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Old 01-16-2007, 07:27 AM   #6
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Steve,

If all else fails I would guess that you should be able to retrieve codes from an OBDI system with the old "count the flashes" procedure.

I'm sure that any basic service manual would give you the procedure ... as in "ignition on, ignition off, what the first flashes should be, etc.

Rog
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