AIR pump seized
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Junior User
Joined: Mar 2004
Posts: 90
Likes: 1
From: Stockbridge Michigan
AIR pump seized
well i got my new E4od in my 91 f150 and when i fired it up the AIR locked up so i can't run it anymore. I put chain vise grips around it and and tried breaking it loose and i can get it to move but it takes a big pipe over the visegrips and no matter how much i move it it won't free up. Do I have to buy a new pump or do they make a belt that bypasses it. I don't care if it pumps air becuase in michigan we don't have emissions testing. It has a 302 in it which i think the pump is different than a 351 or a 300I6. any help would be greatly appreciated.
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
You can bypass it. There is no belt made specifically for this because removal of the air pump is a FEDERAL offense not a local one. I'd replace it. It will keep the cat's from burning out prematurely.
Elder User
Joined: Nov 2006
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From: Pensacola, FL
i was looking at my 300-6 this weekend and am thinking of bypassing mine because of the air diverter leaking. the pulley on the pump and ac compressor look about the same diameter, so i'm figuring i can buy a belt for same truck without ac. or take old belt to parts store and they can match one up that is how ever much shorter you need it to be.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
If you bypass the pump you'll need to remove all the associated plumbing and plug the holes in the heads and vacuum lines. If you don't it will cause drivability problems sooner or later. BTW.. a pump from just about any Ford will work.. the scrap yard is your friend.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Originally Posted by 95Ford4x4
While on the subject. does bypassing the pump and associated parts have any adverse effect on the computer or how the motor will run??
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Elder User
Joined: Nov 2006
Posts: 614
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From: Pensacola, FL
where the diverter screws into the head is where my leak is at. if i remove the system i plan on plugging and blocking off all connections to the motor, just wasnt' sure how the computer would react since i assume the oxygen sensor readings would change.
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Mine's a '95 with a 351w & E4OD (PS & AC). I had 3 pumps go bad in less than 2 years & when the 3rd one started screeching, I got a shorter belt & cut the A.I.R. pump out of the loop. The OEM belt is 102" in length & I replaced it (after measurement AND some experimentation in the parking lot of the Auto Parts Place) with a 94.5" belt a few months ago. I have not removed either the old pump, combo valve, plumbing, etc.
So far, it has worked great. No codes set. Truck runs great. No problems & no more racket.
Ultimately this approach will lead to the death (plating over) of the cat matrix, but I seriously doubt my 13-year old cat is doing anything worthwhile anyhow. I'm glad I cut it out. I may eventually remove the A.I.R. plumbing & pump when it warms up, but so far not removing it has caused no drivability problems at all.
So far, it has worked great. No codes set. Truck runs great. No problems & no more racket.
Ultimately this approach will lead to the death (plating over) of the cat matrix, but I seriously doubt my 13-year old cat is doing anything worthwhile anyhow. I'm glad I cut it out. I may eventually remove the A.I.R. plumbing & pump when it warms up, but so far not removing it has caused no drivability problems at all.
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Joined: Jan 2007
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No, not surprised at all. I'd say you're pretty close to the mark. I use Platinum cats for HC air pollution control on my job (I'n an environmental manager in a chemical plant). In industrial setting (where the emission stream is stable & constant in character), cats rarely last more than 4-5 years, and are never guaranted by the manufacturer to be more than 80% active after 3 years.
If the cat isn't poisoned or plated over, it should last forever. In practice, they never do.
However, my truck has 233,000 mi and the tail pipe is coated with soot. So I think there is a fair (certianly not definate) chance the cat matrix is similarly coated. If it were doing it's job, I wouldn't expect to see this coating on the tail pipe.
If the cat isn't poisoned or plated over, it should last forever. In practice, they never do.
However, my truck has 233,000 mi and the tail pipe is coated with soot. So I think there is a fair (certianly not definate) chance the cat matrix is similarly coated. If it were doing it's job, I wouldn't expect to see this coating on the tail pipe.
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
I would, as the engine runs a little rich when cold, the cat burns off what it can and turns it into water which then turns to steam. The steam condenses as it runs down the pipe and coats everything with the soot. If the cat had stopped working it would more than likely be plugged up causing a very poor running condition.
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Junior User
Joined: Mar 2004
Posts: 90
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From: Stockbridge Michigan
well i forgot to mention that he truck has no cats becuase the exhaust broke off right at the cat so that doesen't afftect me but i don't feel like getting rid of all the plum,bing and plugging holes so i bought a new pump at lunch today a reman from carquest was 55.00 plus a 15.00 core charge. who knows maybe i can use the air it pumps for something? a mobile air compressor? i'll see if i can think of something. thanks for the help
Posting Guru
Joined: Sep 2002
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From: Langhorne, PA
60 dollars, fix it and make sure your emmissions are working, help save the world and your truck. Never underestimate the pleasure of having a perfectly operating "STOCK" truck..You can do all the engineering/modding you want..but sometimes keeping things stock and working well is fun too.
I had the same problem with my pump, swapped the engine, meanwhile the pump just layed on the floor,and it seized up just sitting there. It was fine when it came off, but I think something happens to the vanes when you have it out of the truck, the in and out ports are exposed, and have it upside down sideways and roll it around...
I had the same problem with my pump, swapped the engine, meanwhile the pump just layed on the floor,and it seized up just sitting there. It was fine when it came off, but I think something happens to the vanes when you have it out of the truck, the in and out ports are exposed, and have it upside down sideways and roll it around...
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Joined: May 2006
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From: Central Mississippi
Originally Posted by 924x2150
meanwhile the pump just layed on the floor,and it seized up just sitting there. It was fine when it came off, but I think something happens to the vanes when you have it out of the truck,
) When I cranked it up there was a noise from the air pump that wasn't there when parked. Are these things that weak?Also, my XLT seems to have braided steel lines going to the back of the heads. (Best looking thing under its hood.) Are they like that from the factory?