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Old 07-25-2021, 06:18 PM   #21
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Originally Posted by weatherbie View Post
I have thought about vacuum leaks but testing for those is beyond my ability. Tomorrow I start looking for a good mechanic who has worked on these older engines.

Run the vacuum lines by hand. Get your hands on each line and feel it for condition, hard, brittle and cracks are not your friends. Any of them run HVAC controls, those need insp too. Yes more professional techniques exist. Smoke generators are pretty cool tools based on watching a YT video on their use. Vacuum modules/actuators can be individually tested with a hand operated vacuum pump.

Then install a vacuum gage and get to know your engines normal vacuum characteristics.
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Old 07-25-2021, 07:37 PM   #22
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1991 30' Airstream 30
Cape Elizabeth , Maine
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Originally Posted by PeterH-350LE View Post
Is the ICU for Idle air control valve, or IAC?

I went through 3 Ignition Modules, AcDelco made in China
is this it:
https://smile.amazon.com/ACDelco-217...s%2C272&sr=8-4
It is the ignition control module on the distributor.

A friend of mine who is the garage foreman in my town came over and looked at it today. He removed each spark plug wire from the distributor and thought that cylinder #4 might not be firing. I took an infrared thermometer and measured the exhaust manifold temps at each cylinder and #4 was significantly cooler than the rest. So that will be the focus in the next few days. I wish I had thought of measuring the exhaust temps a while ago, would have saved some time, live and learn.

He also noticed the high pitched whine in the TBI which I had noticed before and thought the IAC might have a leak. That will be the second thing to look at.
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Old 07-25-2021, 08:52 PM   #23
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It is the ignition control module on the distributor.

A friend of mine who is the garage foreman in my town came over and looked at it today. He removed each spark plug wire from the distributor and thought that cylinder #4 might not be firing. I took an infrared thermometer and measured the exhaust manifold temps at each cylinder and #4 was significantly cooler than the rest. So that will be the focus in the next few days. I wish I had thought of measuring the exhaust temps a while ago, would have saved some time, live and learn.

He also noticed the high pitched whine in the TBI which I had noticed before and thought the IAC might have a leak. That will be the second thing to look at.
Just for the record, replacing Idle air control valve fixed my irregular idle problem. But in my case that was just one of many issues I had with the TBI
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Old 07-27-2021, 10:28 AM   #24
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1991 30' Airstream 30
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Swapped out the #4 plug a for a new one this morning. The old plug was gapped at about .055. My understanding is that the gap should be .045, which is what I gapped the new one. The engine runs much better now and after warming up idles at 1000 much smoother than before.

I have read elsewhere that the gap should be either .035 for a non-HEI distributor and .045 for an HEI one. For you non-HEI folks what do you use for a gap? I have read elsewhere people using either one whether their distributor is HEI or not.
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Old 07-27-2021, 05:29 PM   #25
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Swapped out the #4 plug a for a new one this morning. The old plug was gapped at about .055. My understanding is that the gap should be .045, which is what I gapped the new one. The engine runs much better now and after warming up idles at 1000 much smoother than before.
.....

Hmm, 1000 is a high idle for TBI. I thought it should settle at about 750 after warm up?
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Old 07-27-2021, 05:51 PM   #26
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Hmm, 1000 is a high idle for TBI. I thought it should settle at about 750 after warm up?
Mine has always idled around 1000 when running well. From what I have read this is at the top edge of the idle window. I'm taking it for test drive tomorrow and I'll update the idle numbers.
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Old 07-27-2021, 09:18 PM   #27
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Here is what the OEM spec is for the TBI engines. Of course the kitty cat run off somewhere !
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Old 07-28-2021, 05:11 AM   #28
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1991 30' Airstream 30
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Attachment 400555

Here is what the OEM spec is for the TBI engines. Of course the kitty cat run off somewhere !
Thanks. After I posted the gap question I found the same sticker on my air cleaner
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Old 07-28-2021, 10:29 AM   #29
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1991 30' Airstream 30
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Took it for a test run this morning, ran at all speeds. Everything looks good, no abnormal gauges and the check engine light stayed dark! While stopped idle was around 800-900.
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Old 07-29-2021, 07:38 PM   #30
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1991 30' Airstream 30
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Seems like 1 step forward and 2 steps back now. I replaced the IAC today in preparation for a trip. Everything checked out fine and the idle improved. About 50 miles into the trip the check engine light came on with codes for the EGVR, MAP and EST. I was driving in a heavy rain. Tomorrow I'll see if there any issues that could apply to all three. I'm beginning to think either a spurious electrical issue or a vacuum leak. The engine ran fine even after the light came on. Interestingly when I shut down and then restarted the light stayed off. I was under the impression the the check engine light would remain on until cleared.
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Old 08-03-2021, 07:32 AM   #31
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1991 30' Airstream 30
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Delivered

On Sunday we drove it to Newark NJ in order to deliver it to the port for shipment to its new owner in Germany. The 350 mile trip was uneventful. Based on sage advice and some prior experience I ignored the check engine light and let the sound of the engine and the gauges tell me if there was a problem. Engine sounded good and gauges looked fine. On Monday I delivered it to the shipper at the port of Newark. I learned a lot about international shipping this past week and if in the future anyone has questions about international shipping please feel free to contact me.

Thank you all for helping me keep our airstream running over the past 23 years. Maybe in the future I'll be back looking for more
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