Ford - Explorer :: 1991 XLT Won't Start - CEL Is On
Jan 29, 2004
1991 Ford Explorer XLT, 4X4, 4.0L push-rod motor, 315,000K
Problem Part 1: Excessive fuel consumption
Codes for O2 sensor, system lean, some black smoke, unburnt fuel smell, some slight hesitation when accelerating from a stop
I replaced the 02 sensor, replaced the IAC, cleaned the MAF, replaced the coil pack, replaced the plugs, replaced the plug wires, replaced fuel filter, replaced air cleaner, replaced the PVC valve changed brand of fuel, checked tires and "brake binding" - NOTHING. Truck ran "fine" other than excessive fuel consumption. I decided to replace the fuel pressure regulator and before I could get to the parts store we have...
Problem Part 2:
Truck begins to lope along like there is one bad cylinder. It sometimes "fixes" then comes back (all this over a period of 3 days).
Day 4 it's dead - no start.
The motor cranks, the fuel pump "pumps" 3-5 secs KOEO fuel line is clear, return line is clear, filter is clear. There is fuel at the Schrader valve (do not know pressures) and the electrical system seems OK (sparks to all 6cyl). I believe the crank position indicator is OK because the CEL is on KOEO but goes out when cranking. I have no codes because I needed to remove the battery to re-charge. Fuel pump fuse is OK.
Only other information that may (or may not) be relevant is that lately it is slow to heat up. It does not come off "cold" (for the last 4 days). Maybe it's the thermostat or temperature sending unit? Maybe it's because its -30C here. It heats up fine if I block the airflow across the radiator (the old carboard solution).
I have not checked the relay. Where this unit is on the 1991? Don't say fuel pump.
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Have a 91 Exp 4.0 v6, has a no start problem only in the cold weather. Last year, replaced coil pack, fuel pump, crank censor, this winter...same problem. Just will not start when it is cold. No codes, no ck engine. Checked it today...it has no spark. What could cause this? Fuel filter has also been changed. told him to ck crank position censor connector.
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My 1991 Explorer 4.0 4x4 overdrive not working, so far have checked ohms on sensor at trans and it appears to be ok. Also looking for the pinout of PCM under passenger kick panel to see if voltage is being output to the sensor at trans.
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Anyway I have a friend with a Mazda Navaho. 1991, 5spd transmission
It jerks intermittently, and sometimes quite severely. Myself, and 4 other ASE mechanics, and 1 "old ford guru" are stumped. We know we have ruled out the clutch for sure....
We think It started when my friend put a clutch in it. He did not have the flywheel turned . When we looked at it, we were all convinced this was the issue....drive test and dumping the clutch in and out at cruising speeds could replicate the issue. However, he had just bought the truck, and it needed a clutch, however the jerking we think was happening before, but we didn't know as we couldn't drive it till we put the clutch in it.
So we re-did the clutch...had flywheel machined, and got a warranty replacement clutch just in case, and put it back together.
Same issues. so we checked, and tested.
1. Fuel pressure test- passed, no issues
2. Checked fuel regulator for leaks - none
3. Checked for and found no vacuum leaks-none
4. Swept, and actually replaced (3 times) the TPS -is working fine
5. Replaced the MAF - Thought we had it, as we disconnected the MAF and jerking seemed to go away instantly...however few days later jerking returned, and driving with MAF unplugged still jerking.
6. Replaced Ignition Module, checked coils, plugs etc...actually replaced plugs and wires as well
7. Disconnected Transfor case plug to make sure it wasn't the issue as well.
I really don't know what else to check. The motor runs fine, the trans shifts smoothly...the clutch is new and was done correctly. I run a small auto shop, and we have access to Mitchells, All-Data, and Identifix....all were no dice. It seems you try and research jerking and hesitation all the hits come up for Auto trans and Torque converter lockout issues. This truck is a 5 spd .....
I have owned many Aerostars back in the day (loved em, same 4.0) and I have never seen this
The jerking is random and intermittent...symptoms would be similar to a small child flicking a light switch on and off rapidly when it does it. power, no power, power, no power, and rapidly...it feels like someone herky jerking on the clutch but we have ruled that out....its definitely electrical.
Also, and naturally, even though it is Obd I we have checked and there are no pending nor stored codes....PCM thinks everything is hunky dory. No backfiring, no smoke, no misfires....runs like new except this perplexing issue.
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I just got a '91 Explorer. It has no brake lights at all. I've checked all the fuses and everything's fine there.
What's the next thing to look at? I can't say I've seen this problem before.
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I just bought it off my friend yesterday and I noticed the back door doesn't lock, the glass part doesn't either. How I could fix it?
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My voltmeter (91 Explorer) bounces with loads, i.e. when sitting at a stop light with the brake lights and turn signal on.
Revving the engine up doesn't seem to work. What does this indicate? Bad battery? Bad alternator or voltage regulator?
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I'm fixing up my 1991 Ford Explorer Sport. I've replaced door panels, handles, center console, seat upholstery etc... I'm now looking for a replacement headliner. I've already checked LMC without any luck. Also my windows will not roll up/down even though the electric window motors are working. I can push and pull the windows up and down by hand while pushing the corresponding direction on the door control so it seems the mechanism is just slipping against the window. What exactly is this mechanism? what do I need to fix this problem?
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At highway speeds above 60 mph on a smooth road, the vehicle runs fine. But if the road has any bumps at all, even small ones, it starts to vibrate very fast as long as there are bumps. The steering wheel almost becomes a blur. It's like it's going into oscillation.
The wheels have been balanced and rotated. The movement the steering wheel is not side to side, like I have experienced with imbalanced wheels.
The shocks look fine and I am told that they are OK by the tire dealer . I have never had this kind of a problem with bad shocks. The vibration is just too rapid.
Before I take the truck in for the mechanic to inspect it, I would like to know what the problem might be.
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The other day, my father-in-law was driving my '91 Explorer and it just died on him. I assumed that the fuel pump quit becuase it wouldn't come on when the switch was turned on. I had a brand new lying around so I dropped the tank and put it in but it still won't work. I checked the inertia switch and it wasn't tripped. There is no power coming to the new pump at all. When the switch is turned on, there is a noticeable "click" inside the engine bay. Would that be the fuel pump relay making that "click"?
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After sitting on a steep driveway for three years, no starting done all that time,I filled all tanks, started it up, drove it on and off 8 times for 50 miles, air in top radiator tank along with rusty water, dare we flush the system being 280k miles old with 40k on new radiator/ also is there a socklike screen over the fuelpump in the tank that may need cleaning to start quicker than two to three starter attempts?
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I have a 1991 Ford Taurus 3.0 V6 and when we go to start it, the thing tries to keep starting(turning over). Even after the key is turned off and removed. The starter just keeps going. Have to remove positive battery cable to stop it. While it was doing that the neg wire started to smoke. If I just touch the battery cable back on it tries to start. If it sits for a bit we can hook it back up and it works ok. I just had the starter and the starter solenoid replaced.
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My 1991 ranger with a 4.0 turns over but will not start. It acted like it ran out of gas put again seems to do ok then it did same thing it sat over night then would not start so I thought I would put some gas in the intake so it starts ran real rough but smoothed after a few minutes ran fine after that next morning same thing no start did same put gas in intake at first no start just turned over didn't even try let it sit for awhile then tried again it fires up ran rough but ran now I get nothing just turns over pulled codes 22and 122 replaced both had ignition mod checked its good new coil pack no change so at this point i hear fuel pump kick on fuel getting to fuel bar but seems a bit week on pressure going to get pressure gauge and see what it says but in the meantime I am loosing my mind...
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Have a 91 Aerostar that won't start. Has fuel pressure, pulse to fuel injectors, strong spark, strong compression, etc.
Thinking that the spark may be coming at the wrong time I tried a spare ignition module that I keep. No luck. Since my distributor had a lifetime warranty I got another one, again, thinking spark was coming at wrong time. Nothing. Engine won't even pop.
I am going to drop the front pipe in the unlikely even that the new converter is plugged or, somewhat more likely, the muffler, but I am leaning toward a computer at this point.. Still don't understand since it is getting spark and gas why engine won't even pop.
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Getting the Banana ready for it's smog test appt at the shop last night (it WAS today) Check engine light had popped on and it had been starting to sputter and surge at the idle occasionally for the last few days so I took a look at the MAF and saw dirty wires. Aha I can fix that, a couple squirts of MAF cleaner, plug it back in and voila! No more light, the Banana ran down the road around the block, over the hill and through the dale like a champ. I shut her down and call it a night.
This morning, hop in and fire the Banana up like usual and all I get is a nice peppy crank over. The Banana has had a bunch (pun intended) of new parts throw at her recently... new battery, starter solenoid, plugs and fuel pump relay and fuel filter. All within the last couple of months.
Out of complete disbelief, I ground on the ignition for a little while and she finally kicked over and sputtered to life. I let her idle a couple of minutes and things seemed fine so off we go. I make it about a block before the Banana starts hiccuping and bucking like something possessed and dies.... kaput.
The Banana has a 3.0, manual transmission and at least half a tank of fuel. Long story short and a tow truck ride home again, half a day trying unsuccessfully to pull a code, any code.... nothing. She will half-heartedly cough and spastically run with ether shots and near as I can tell I'm not getting fuel to the fuel rail relief port. I'm really hoping there is some way to diagnose a faulty fuel pump without having to drop the tank and fish the damn thing out.
I'm not hearing it run when the ignition is turned on but then again I don't think I've ever heard it run. Any other things to try before I replace the pump itself???
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Grandson 1991 Ranger 3.0 v6 69,000 miles We have a long start issue after it has sat for 30 mins. plus. If you open the throttle part way while cranking it will start fairly easily. Fuel pressure comes up instantly when you turn on the key. It runs at 39 psi pull the vac line off regulator it jumps to 49 psi. Fuel pressure does drop to about 30 psi after setting an hour. It kinda acts like it is flooded when it starts. so far we have done a complete tune up plugs wires cap and rotor. The ignition module has been replaced twice last one a real Motorcraft. New fuel pump and filter. Cleaned the fuel injectors with Ford cleaning system. I will replace the coil next and maybe clean the iac.
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I have 91 camry that when you go to start it, it turns over then makes a chugging/choking sound and wont start. battery is good bc the radio/lights/etc come on, and i can put everything into gear. Its about 35 degrees here so im hoping that it may just be needing some antifreeze which is on the way.
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I now have a 1991 ranger 3.0 super cab. I need a step by step walkthrough of how to time it. Keep in mind that I ha the distributor out while turning the engine over so I need from start to finish, including the spout connector. It runs right now but idles high at the start and the. Stumbles down to about 500rpm and sometimes dies....
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I have a 91 Ranger 4cyl. Tune up about 2 months ago. Mileage about 178,000. When the temperature gets below about 45 degrees, the truck will not start. It cranks like the battery has plenty of juice but refuses to start. Once the temp warms up, the truck will start first crank.
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W e got the car fixed last year. It was a 8 pin connector near the camshaft sensor called the Engine Wiring Connector.
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I recently purchased a 1991 Volvo Turbo 740 with 186,000 miles on it. It runs perfect for a few days and then when parked will not start. Attempt to start 1/2 hour later it starts and runs perfect again. It has done that for several days now. I have driven it to locations approximately 40 miles round trip with frequent stops for a period of time and then start up again. This AM it started up perfect as I moved it from a driveway to part in front of my house on the street. Several hours later I went to start it but it would not start. 1/2 hour later I decided to try one more time before calling the tow truck to take to a mechanics and it started up perfect again. I drove it to the library and bank later and ran perfect after the two stops. This is driving me nuts since I had taken it to a mechanic when it did this Monday and it ran great at the mechanics and he could not determine what was wrong. He told me WHEN it stops again to have it towed in and he could determine at that time when it was not running.
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