Check Engine Light and AC Conversion
Thread Starter
|
Freshman User
Joined: Apr 2000
Posts: 33
Likes: 0
Check Engine Light and AC Conversion
Ok, a couple of things here. I have a '91 F-150 2wd with 4.9 I6, 3.08 rear and 5 sp. man. OD tranny. Ever since I have had the truck, the Check engine light has been on. The previous owner had it into the dealer and they couldnt find a problem. The light comes on when the engine has driven for a couple of miles and stays on as long as the engine stays warm. Any Ideas?
Also, I want to convert my AC system to R134a. My compressor is busted so I definately have to get a new one of those, but is there anything else that I need to change on there? What am I going to have to do?
Thanks
Josh
Also, I want to convert my AC system to R134a. My compressor is busted so I definately have to get a new one of those, but is there anything else that I need to change on there? What am I going to have to do?
Thanks
Josh
Senior User
Joined: Feb 2000
Posts: 208
Likes: 1
Check Engine Light and AC Conversion
sounds like it could be a bad oxogen sensor. I think they start working once warmed up, so if it is faulty it wouldn't send a bad signal for a couple of minutes. If this is it i don't know why the dealer woulndn't have caught it.
Posting Guru
Joined: Feb 2000
Posts: 1,100
Likes: 0
From: Wichita USA
Check Engine Light and AC Conversion
Does the check engine light generate any codes? As for A/C conversion. You will need a Compressor, orfice tube ( apart of high side line), Accumulator, retro fittings, pag oil, o-rings, flush compond, a way to flush the system, filter in high side line, a way to recover old R12, a way to vacuum system, a way to charge R134. Be warned that these original compressors fail to a problem known as BLACK DEATH. If this has happened to yours you will also need to replace the condensor. IF there is a lot of black discoloration in side the lines when you remove them it has Black Death.
Posting Guru
Joined: Feb 2000
Posts: 1,100
Likes: 0
From: Wichita USA
Check Engine Light and AC Conversion
I believe there is a trouble tree type of diagnostics avaible for that symptom in mitchell manuals. If the compressor shaft broke due to internal failure that would cause metal to be introduced into the lines you are still going to have to replace all the above mentioned items. Sorry.
Thread Starter
|
Freshman User
Joined: Apr 2000
Posts: 33
Likes: 0
Check Engine Light and AC Conversion
Ok, so Im gonna have to replace those parts, thats a given. Hows this sound: I want to take a compressor off of a 89 F-350 and put it in my 91 F-150, will this work? Id rather do this because I can get this for free instead of paying the $300 or so dollars to get a new/reman one at the parts store. Can I still use it even though it is an R12 era compressor, or do I have to get one that is for the R134a?
Thanks
Josh
Thanks
Josh
Elder User
Joined: Nov 1999
Posts: 780
Likes: 1
Check Engine Light and AC Conversion
I have a replacement R-12 compressor in my '91, installed at great expense by an out-of-state shop while on vacation. The largest part of that expense was R-12.
I vowed to myself that there was no way that was going to happen again should the A/C system crap out.
It did.
I bought all the R-134 O-Rings and other conversion parts at Carquest, then found a smaller shop to properly do the work.
All A/C shops seem to have one thing in common: "...You won't like 134; it doesn't cool as well as 12..."
My bought-new pickup has leaked Freon since Day One--and I can buy 134, on sale cheap at K-Mart, without a license, and add a can myself when necessary.
134 cools just fine, thank you very much.
Ed
I vowed to myself that there was no way that was going to happen again should the A/C system crap out.
It did.
I bought all the R-134 O-Rings and other conversion parts at Carquest, then found a smaller shop to properly do the work.
All A/C shops seem to have one thing in common: "...You won't like 134; it doesn't cool as well as 12..."
My bought-new pickup has leaked Freon since Day One--and I can buy 134, on sale cheap at K-Mart, without a license, and add a can myself when necessary.
134 cools just fine, thank you very much.
Ed
Trending Topics
Posting Guru
Joined: Feb 2000
Posts: 1,100
Likes: 0
From: Wichita USA
Check Engine Light and AC Conversion
You can use the 91 compressor if it is a FX15 style. Ford used two styles in that era FX 10 and FX15. Problem is they both look the same. The only difference that I know of that you can see is the spline count on the compressor shaft. If memory serves me the FX15 has less than the FX10. You will need to know. The reason for not using the FX10 is because of the higher pressures incountered with using R134 and the inability of the FX10 to hold up.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Freshman User
Joined: Apr 2000
Posts: 33
Likes: 0
Check Engine Light and AC Conversion
[font size="1" color="#FF0000"]LAST EDITED ON 25-Jul-00 AT 01:41 AM (EST)[/font][p]So the compressor has to be an FX15 to work, is there any other way of finding out what it is without pulling it out and counting splines?
Posting Guru
Joined: Feb 2000
Posts: 1,100
Likes: 0
From: Wichita USA
Check Engine Light and AC Conversion
I did some research today from my mitchell manuals and also from some information I get when attending A/C seminars. I was in error about the compressor types. The 87 thru 91 F series all use the FX15 compressor which is designed for R12 systems. When they went to R134 they beefed it up and labled it a FS10. The FS10 is the compressor you will get if you buy a new one even if you are staying with R12. Sorry for misleading you. I don't usually pay any attention to what I remove when changing compressors because I only use new which are all 134 compatiable. Any way end result is the 89 you are wanting to use is an FX15 and will probably not last in a conversion. If any one out there has had suscess with converting a FX15 please let us in on it.
Thread
Thread Starter
Forum
Replies
Last Post
fixnair
1948 - 1956 F1, F100 & Larger F-Series Trucks
4
Jun 2, 2013 07:01 PM
theenforcer
1999 - 2003 7.3L Power Stroke Diesel
16
May 12, 2009 07:27 PM
forwardcontrol
Ford Inline Six, 200, 250, 4.9L / 300
1
Jul 29, 2002 06:55 PM
