No power.
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
No power.
I've been on here awhile but I need some help ,idea's.I don't want to do more work than I have to..I have a 94 and two 96's The one 96 is like new so we won't talk about that one. my 94 and 96 4.0 have no high rpm power. If you are doing 30 mph and punch it it goes and then just bogs. I can do 65 on the high way but little more. funny because I test drove another which was just like mine. So thats 3 4.0's that lack power. What to think? Sounds like it probably happens all the time to older aero's. Is it a clogged cat? Because of not changing o2 sensors! How many have seen clogged cats? Anybody? Engine need decarbonizing? Oh I have an exhaust leak on the 94 and it doesn't run any better.. If it were fuel you would likely here popping in the intake if you floor it with not enough fuel, a normal lean condition. That doesn't happen. My 94 is being turned ito a parts car for the 96. Any idea's.
Thanks
Dick
Thanks
Dick
Lead Driver
Joined: Sep 2003
Posts: 7,016
Likes: 208
From: SoCal
My 1990 4wd extended has very sluggish performance, but my 1991 2WD feels very peppy in comparison. Both are 4.0 liter v6 engines, so I have to think that the difference is due to the extra couple hundred pounds of the 4wd drive train and the seat bed in the 4wd van. The 4wd vehicle also doesn't stop as readily, again, probably due to the added weight.
Have you ever done a 0-60 timing on yours?
Have you ever done a 0-60 timing on yours?
Posting Guru
Joined: Aug 2007
Posts: 1,036
Likes: 2
From: Portland, Oregon
My dad's 94 4.0l awd has acceleration problems... i was told by dudes on here/at auto stores that it's most likely the TPS (throttle positioning sensor). my mom's 95 4.0l 2wd is has a TON of guts, and as far as i can tell the 93 awd we just picked up has lots of guts too, and accelerates quickly. i personaly drive a 3.0l, and love mashin on it.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
your 96 has OBDII engine control. will tell you far more about engine op than older aeros
get an OBDII code reader or even better a scanner for diagnostic.
start with codes and then we will move up to scanner readings of O2 sensor dynamic function out on the road and MAF performance.
we want to look at any miss codes and short and long term fuel trims
http://www.motorcraftservice.com/vdirs/diagnostics/pdf/obdsm963.pdf
start with the engine decarboning and ring pack cleaning first. do the Berryman B12 or Seafoam method, water mist will only remove combustion chamber deposits. i use 1/8" tube into TB hole at 2k rpm into hot engine-whole can, let soak, out to freeway and hard accelerations for 20 mile trip
how many miles on front O2 sensor?
what does MAF element look like under magnification, clean?
do you feel all 3 shifts on up acell plus TC lockup?
and downshift on acell?
get an OBDII code reader or even better a scanner for diagnostic.
start with codes and then we will move up to scanner readings of O2 sensor dynamic function out on the road and MAF performance.
we want to look at any miss codes and short and long term fuel trims
http://www.motorcraftservice.com/vdirs/diagnostics/pdf/obdsm963.pdf
start with the engine decarboning and ring pack cleaning first. do the Berryman B12 or Seafoam method, water mist will only remove combustion chamber deposits. i use 1/8" tube into TB hole at 2k rpm into hot engine-whole can, let soak, out to freeway and hard accelerations for 20 mile trip
how many miles on front O2 sensor?
what does MAF element look like under magnification, clean?
do you feel all 3 shifts on up acell plus TC lockup?
and downshift on acell?
Thread Starter
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Originally Posted by xlt4wd90
My 1990 4wd extended has very sluggish performance, but my 1991 2WD feels very peppy in comparison. Both are 4.0 liter v6 engines, so I have to think that the difference is due to the extra couple hundred pounds of the 4wd drive train and the seat bed in the 4wd van. The 4wd vehicle also doesn't stop as readily, again, probably due to the added weight.
Have you ever done a 0-60 timing on yours?
Have you ever done a 0-60 timing on yours?
I just wanna know if anyone has seen a clogged cat.. Tps won't do that..I have a advanced scanner so I can look at fuel trims etc. O2's may be bad but it would have top end still.. Keep the idea's comming guy's.
Dick
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
The van needs a tuneup. I am in the catalytic converter business. Our company has been around for over ten years, and I have been working here for about 4, and in my 4 years, I have never seen a clogged aero cat. A clogged cat, would be caused by other problems that would also cause a loss of power, i.e., a desperate need for a tuneup. A plugged fuel filter or a plugged air filter, will both cause loss of top end power, as can a faulty TPS, a bad MAF, a lazy O2 sensor, etc. A clogged cat will have the same behavior, but the cause of the clogged cat must be addressed as well.
Thread Starter
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Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Thanks for the cat info..I have never heard of a clogged one also...Who knows where or if there is a place to test fuel pressure on the 4.0?
Dick
Dick
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Elder User
Joined: Aug 2005
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I had a clogged cat on a ford motorhome in Alaska. Symptoms were continuously decreasing [power like a clogging fuel filter, eventually over 8 hours vehicle would only idle. Vehicle would first go 70 mph, and downward over the 8 hour period to 20 mph, then 10, then the tow truck. Diagnosis absolutely confirmed by post mortem. Removed cat, vehicle had full performance restored instantly.
Ken
Ken
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Lead Driver
Joined: Oct 2004
Posts: 8,062
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From: Central Oregon
I have a 91 AWD with the 4.0 engine and the cat's are pluged on it, it was my father-in-laws and he was feeding it a lot of stop leak for a bad head gasket. It would only run up to about 30mph, flat out.
Former ******
Joined: Nov 2004
Posts: 4,901
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From: Salt Lake City, Utah
Yes, but the ford motor home is nothing like an Aerostar. The cats on those oversize ford are working harder and were poorly constructed (too large and substandard packing, they heat up unevenly and crack). The symptoms match, but there are other possible causes here that are less expensive an easier to test. There is a schrader valve on the top of the fuel rail where you can test the fuel pressure. It looks like a bicycle tire valve. Should be near the fuel pressure regulator.
For clogged cats, the four major things that clog them is either too much fuel entering the exhaust, oil entering the exahust, antifreeze entering the exhaust, or physically broken substrate either from poor design, one of the above issues, or impact damage.
The good news on replacing the cats on an Aero if it comes to that, is that they are relatively easy to replace (which is a relief, since little else is.)
For clogged cats, the four major things that clog them is either too much fuel entering the exhaust, oil entering the exahust, antifreeze entering the exhaust, or physically broken substrate either from poor design, one of the above issues, or impact damage.
The good news on replacing the cats on an Aero if it comes to that, is that they are relatively easy to replace (which is a relief, since little else is.)
Lead Driver
Joined: Sep 2003
Posts: 7,016
Likes: 208
From: SoCal
I use this fuel pressure gauge on my Fords:
http://store.summitracing.com/partde...5&autoview=sku
It was made for the EFI v8 of the 86-93 Mustangs, but it uses the female Schrader fitting that mates to any fuel rail that has a male Schrader valve, like most Fords. It is great for diagnostic purposes, but I would not leave it on for regular driving. (However, I didn't realize its price has doubled since I bought mine.)
I'm sure there are other gauges that will work, just make sure that they read at least 50 psi.
Too bad there isn't an easy way to check the pressure ahead of the catalytic converter.
http://store.summitracing.com/partde...5&autoview=sku
It was made for the EFI v8 of the 86-93 Mustangs, but it uses the female Schrader fitting that mates to any fuel rail that has a male Schrader valve, like most Fords. It is great for diagnostic purposes, but I would not leave it on for regular driving. (However, I didn't realize its price has doubled since I bought mine.)
I'm sure there are other gauges that will work, just make sure that they read at least 50 psi.
Too bad there isn't an easy way to check the pressure ahead of the catalytic converter.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
easy to test pre cat exhaust pressure
pull the primary O2 sensor on OBDII vehs in front of the cat.
make up an adapter string from home building store
i use my fuel pressure gauge.
max pressure in front of a CAT at 2k rpm is 3 psi. anything higher is exhaust restriction
only rigs i've seen plugged cats in is 1990s Hondas. must be mount position and construction.
far more common is active metal poisoning which limits cat efficiency and causes emissions test failure
pull the primary O2 sensor on OBDII vehs in front of the cat.
make up an adapter string from home building store
i use my fuel pressure gauge.
max pressure in front of a CAT at 2k rpm is 3 psi. anything higher is exhaust restriction
only rigs i've seen plugged cats in is 1990s Hondas. must be mount position and construction.
far more common is active metal poisoning which limits cat efficiency and causes emissions test failure
