1990 E150 5.8L Vacuum
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Lead Driver
Joined: Mar 2006
Posts: 6,259
Likes: 438
From: IL
I am still able to find all three types of canister at the wrecking yards in my area
New ones are not expensive either but nobody has one right now
The problem is always the mounting and I like stock placement or OEM parts
The older truck coffee can type ones break the bolts off when you remove the inner fender panel for other repairs
I find the exact replacement for my clients but any one you find or want to use will work
All they do is hold some vacuum on reserve for wide open throttle when no vacuum is present
Supplies to the HVAC and in the old days the transmission vacuum modulator
Defrost is the default mode for if the hvac system if it looses vacuum
So if your plastic canister cracks or your coffee can rusts out you will have defrost only
New ones are not expensive either but nobody has one right now
The problem is always the mounting and I like stock placement or OEM parts
The older truck coffee can type ones break the bolts off when you remove the inner fender panel for other repairs
I find the exact replacement for my clients but any one you find or want to use will work
All they do is hold some vacuum on reserve for wide open throttle when no vacuum is present
Supplies to the HVAC and in the old days the transmission vacuum modulator
Defrost is the default mode for if the hvac system if it looses vacuum
So if your plastic canister cracks or your coffee can rusts out you will have defrost only
Hotshot
Joined: Jul 2020
Posts: 10,470
Likes: 2,632
From: Near Salt Lake City
Check the exhaust for being plugged (the converter) next time you drive it (start it)
Use a vacuum gauge
Gauge installed read the vacuum 15 inches lets say (does not matter the actual reading)
You floor the gas WOT the gauge drops to zero momentarily on a good exhaust then picks right back up to 15
If Your exhaust is plugged the gauge will never get back to 15 inches at WOT and will hover around 8 inches
Use a vacuum gauge
Gauge installed read the vacuum 15 inches lets say (does not matter the actual reading)
You floor the gas WOT the gauge drops to zero momentarily on a good exhaust then picks right back up to 15
If Your exhaust is plugged the gauge will never get back to 15 inches at WOT and will hover around 8 inches
Thread Starter
|
Lead Driver
Joined: Mar 2006
Posts: 6,259
Likes: 438
From: IL
Check the exhaust for being plugged (the converter) next time you drive it (start it)
Use a vacuum gauge
Gauge installed read the vacuum 15 inches lets say (does not matter the actual reading)
You floor the gas WOT the gauge drops to zero momentarily on a good exhaust then picks right back up to 15
If Your exhaust is plugged the gauge will never get back to 15 inches at WOT and will hover around 8 inches
Use a vacuum gauge
Gauge installed read the vacuum 15 inches lets say (does not matter the actual reading)
You floor the gas WOT the gauge drops to zero momentarily on a good exhaust then picks right back up to 15
If Your exhaust is plugged the gauge will never get back to 15 inches at WOT and will hover around 8 inches
Hotshot
Joined: Jul 2020
Posts: 10,470
Likes: 2,632
From: Near Salt Lake City
No, it can happen suddenly if the converter substrate breaks up
Gets me thinking though
Go smack the cat(s) around some with your clenched hand and see if it (they) rattle inside indicating it is broken up inside
Sounds like you might have a miss Mike
A plugged exhaust engine will run fine until the rpm increases and some fuel is put to it
Then it cannot exhaust all the combustion so the engine slows down
You might have a miss and or a bad fuel pump
I just wanted you to check the exhaust because that is a common cause of your symptom
Gets me thinking though
Go smack the cat(s) around some with your clenched hand and see if it (they) rattle inside indicating it is broken up inside
Sounds like you might have a miss Mike
A plugged exhaust engine will run fine until the rpm increases and some fuel is put to it
Then it cannot exhaust all the combustion so the engine slows down
You might have a miss and or a bad fuel pump
I just wanted you to check the exhaust because that is a common cause of your symptom
Thread Starter
|
Lead Driver
Joined: Mar 2006
Posts: 6,259
Likes: 438
From: IL
No, it can happen suddenly if the converter substrate breaks up
Gets me thinking though
Go smack the cat(s) around some with your clenched hand and see if it (they) rattle inside indicating it is broken up inside
Sounds like you might have a miss Mike
A plugged exhaust engine will run fine until the rpm increases and some fuel is put to it
Then it cannot exhaust all the combustion so the engine slows down
You might have a miss and or a bad fuel pump
I just wanted you to check the exhaust because that is a common cause of your symptom
Gets me thinking though
Go smack the cat(s) around some with your clenched hand and see if it (they) rattle inside indicating it is broken up inside
Sounds like you might have a miss Mike
A plugged exhaust engine will run fine until the rpm increases and some fuel is put to it
Then it cannot exhaust all the combustion so the engine slows down
You might have a miss and or a bad fuel pump
I just wanted you to check the exhaust because that is a common cause of your symptom
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LeeTribeRide
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