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Old 05-22-2015, 10:28 AM   #1
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Timing a 1990 454 TBI - Itasca Windcruiser 37

My best Friend has a 1990 Itasca Windcruiser by Winnebago industries with a 454 TBI Chev in it and I'm trying to help him set the timing. From searching the web I've determined that the timing should be at 4 degrees BTDC with the PCM wire for timing unplugged. Problem is the top timing tab at 1 o'clock position can't be used with the #1 plug - no line of sight.

From underneath I found another timing tab on the pan at about the 5 o'clock position. Some web files I've stumbled across say use cylinder #5 or #8 and others say just #5 and others say #4 or #7.

I was able to get underneath and see the timing mark flash on #4 wire only when running, no visual of the mark on other plug wires based on where the distributor was.

While on #4 cyl wire, I had my buddy rotate the distributor a lot until I could get the pulley mark to line up at the 4 deg BTDC but it seems to idle and labor rough at that setting. Wondering if # 4 cylinder is not the one to use?

Can anybody tell me with certainty if it's cylinder # 5, 8, 4 or 7 on 1990 Itasca Windcruiser by Winnebago industries with a Chev 454 TBI when timing from underneath using the bottom timing tab at the 5 o'clock position?
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Old 05-22-2015, 11:11 AM   #2
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The spark control module may require , a procedure ( wire disconnect ?) to set it into , timing adjustment mode. If not properly set , the module will always run some advance , so you won't get a good base timing adjustment.
Dodge modules did in the early 90's Chevy may be the same.
Didn't the web search turn up the full procedure ?
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Old 05-22-2015, 11:33 AM   #3
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Use number 5 I will try to remember you have to remove a wire from the computer to time give me a bit ill try to remember
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Old 05-22-2015, 11:40 AM   #4
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Quote:
Originally Posted by whem2fish View Post
Use number 5 I will try to remember you have to remove a wire from the computer to time give me a bit ill try to remember
Could be a wire to remove ; or a wire to be grounded while using the timing light, I can't remember for sure.
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Old 05-22-2015, 12:15 PM   #5
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Thanks everyone. I've got the timing wire disconnect thing figured out - its next to the coil - green wire with black stripe. I guess #5 is the consensus.
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Old 05-22-2015, 01:19 PM   #6
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Yes, #5 when timing from below.
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Old 05-22-2015, 01:33 PM   #7
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Thats what I remember.




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Old 05-22-2015, 01:55 PM   #8
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Correct
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