Ford Ranger / B-Series :: 1986 - Starts And Runs Rough / Bad Misfire
Jan 11, 2015
My pops has a 86 ranger with a 2.9. And what its been doing is, it will start up just fine then u give it a minute and itll start to run very rough like a bad miss fire, then if he revs it up for a bit. It will clear out and then run just fine until he starts it up again and it seems to do it more the colder it gets and it smells very rich. Iv checked the injectors and there fine, what other things could it be ? O2 sensors oorrr
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I have a really nice 1986 Ranger XLT with a 2.9 V6 (injected) and OD Automatic with about 135k miles. I've had the truck for over ten years and have been pretty happy with it. I'm still trying to correct a couple of nuisance items:
1. Sometimes it runs smoothly, and at others it has a rough idle, and once in a while it will even stall. Before it stalls, it idles or runs roughly, and will miss erratically. When it quits, it does not fade out like it is running low on gas; it quits suddenly, like the ignition is turned off. If I am driving at highway speeds, sometimes it will buck as it misses, and sometimes stalls out. But it always starts up right away afterwards. This does not happen often, but when it does, it happens several times over hours or days, and then goes away by itself for months, even years, and then comes back for another round.
I was hoping whatever was wrong would totally fail, but it has been several years and is not getting better, nor worse. Fuel mileage varies, too, from 16 to high 20's MPG. I have new low- and high-pressure fuel pumps (dual tanks), new gas and air filters, checked all the electrical connections, put in a new ignition switch, new O2 sensor, Air Flow sensor, EGR, replaced all the vacuum lines, new battery and cables, new starter, all new electrical relays, fuel pressure regulators, new fuel pump inertia switch, tuned up engine (incl. wires, cap, rotor, ign module, plugs and timing), and cleaned out the already sparkling-clean tanks.
2. My oil pressure will drop at idle to low-normal when the engine is warm. It never goes to below Normal on the gauge. I have replaced the gauge, sending unit, and oil pump. This is a long-term issue, and is not getting any better or worse.
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'88 Ranger 2.9L V6 starts and runs but shuddering. Most noticeable when shifting and revving the engine. Will a dead cylinder cause this? How do I check?
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I have a '92 Ranger with a 2.3 liter engine. She starts and runs a couple of seconds and shuts down. I'm thinking maybe a fuel pump is not putting out thepressure needed. Gotta go to work tomorrow and gotta get the truck running today.
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I just changed the plugs and wires on my 2008 Ranger 3L. Now it runs rough with no power. It was fine before I did the work but I thought I should change the plugs at 215000KM. I used Ford wires but unfortunately I used Bosh platinum plugs and now think I will change to Ford plugs. Do you think the Bosch plugs would be that bad for the Ranger? What is the belt tensioner torx size? I had to move the A/C compressor over to get the #4 plug but had a very hard time trying to loosen the belt.
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This has been an ongoing issue for about a month. When I start the engine after it has been sitting and is cold it runs ruff for about a minute then smooths out and runs fine. I pulled a P0304 code (cyl.4 missfire) but I do not get a CEL.
I checked the plugs and they were ok but I changed them and the wires anyway as it just turned 50k and the plugs were original. I could live with a little cold ruff idle but the code throwing bothers me. The truck is a 2000 xlt 4x with auto trans. and 4.0 engine. This is my second 4.0 ranger but I have only had it for about 6 months.
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I am working with a friend on his 99 Ranger with a 4.0 . When first started it will idle rough and hesitate for the first 300 feet or so, and then clear up and run smooth the rest of the day. If he lets it set for 6 or more hours it will repeat the problem. He has taken it to a local Ford dealer and they have replaced spark plugs, plug wires, coil pack, cleaned the throttle body, checked the air idle motor and passage.
He has had it to the dealer 3 times and their latest plan is to pull the heads @ a cost of 1500.00 to start. Since it runs well, no coolant in oil or oil in coolant nor loss of either fluid, I couldn't figure why they want to pull the heads.
To date it has not thrown a code, I ran it on a New Generation Star tester and cannot find a code. The truck runs great after the first intial start up and does not give any signs of cutting out or lack of power. My guess is it is losing fuel pressure overnight and is taking a while to reprime. Original fuel pump and 160K miles. Will do a fuel pressure test this weekend.
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I have a huge problem. My 94 ranger 2.3L 5 speed manual transmission, has problems with idoling while it's cold, has no power going uphill and stalls when I slow down to stop. This is all after putting a new motor in. The old one was running ok with 310,000 but lagging bad. I figured with the driving I do, a new motor wouldn't be a bad thing. Boy, was I wrong. It has been a nightmare. But once the truck is up to operating temperature, it runs so smooth you wouldn't think there was a problem. But let it cool off, restart, and boom! There it is. We have changed so many parts and sensors with absolutely no change to the original problem. It's very frustrating. I just can't let this problem win. I will figure it out.
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2003 Ranger FX4 Flareside
4.0
Automatic
145,000 Miles
Here's my issue: My Ranger has been running like a dream until yesterday.
I took off on a parts run for my sons Ranger. I got to a stop sign and as I stopped, it started missing and barely running. I nursed it back home and checked the flashing CEL. It was giving me a misfire on #3.
Since I had been planning on changing the plugs and wires, I dove in and got it done hoping that was the cause of the misfire.
Started it up, same thing. I went to the next obvious item: coil. Replace it, still running like crap. Gave up for the night.
Today, I thought I would dig in using the tips here on the forum. Did the spray down...no errant spark anywhere. Tested fuel pressure: 65psi no drop in pressure on acceleration.
Started pulling wires off the coil one by one. Four of the wires resulted in running worse. 2 had no effect. #3 and #6. The coil was producing plenty of spark on all 6 ports.
At this point I was sure it had to be 2 bad injectors. Since I couldn't get injectors tonight, I moved them around after cleaning them a bit and tried my wire test again. The problem stayed on the back 2 cylinders!?!
I tested for voltage on the back injector plugs and I am getting voltage. I also used a stethoscope to listen to all of the injectors. The back 2 seem to remain silent. I have also unhooked the battery for 20 minutes to reset the PCM. Still missing and running rough....
Here's a list of what I have done:
Autolite Double Platinum APP5144 plugs. .062 gap
Autolite Pro Series wires #97051
BDW E97P Coil
New air filter
What should I do next? I really don't know where to go next.......
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I have a 2002 ford ranger xlt 3.0 i just rebuilt the entire motor about a month ago and was having a high idle problem for the longest time. turns out i had the iac on backwards. but now that it idles down around where its supposed to it has a rough idle has a little shake to it. starts up right away but when i drive down the road around 3000-3500 rpms its missing on cylinder #3 from what the code I am getting "multiple cylinder misfire, #3 cylinder misfire" I've replaced plugs and wires. camshaft pos sensor. I am getting 65 lbs of fuel pressure. spark on all cylinders. I am really at a dead end here. Also every time I take the plugs out to look at them they look brand new.
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So I have a 2001 ranger 2.3l . Runs very rough at idle.code says misfire in cyl.#1. I have changed plugs, wires, coil packs all motocraft. I did a compression test..
#1.170
#2 180
#3. 185
#4 . 180
Compression seems fine,but where do i go from here? Anything else i can check/replace to solve this?
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I have a 03 ranger with a v6/auto trans. it drives fine around town. after i get on the freeway the overdrive light will start flashing. when i get off the freeway it will shift extremely rough. if i turn the truck off and right back on it will be fine again. What could be the problem?
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My 3.0 with 216k miles has developed a rough idle and it progressively got better with new parts and cleanings. On startup it revs up to 2k then back down to 600. If I let it idle for about 8 or so minutes my Check Engine Light starts flashing. If I drive about for a little bit it stops and is just fine.
While the light is flashing I get codes P1000, P0305, P0306, and P0316. Which are OBDII Monitor Testing Not Complete, Misfire detected in Cyl 5, Misfire detected in Cyl 6 and Engine Misfire Detected on Startup (First 1000 Revolutions) respectively. Any other time the truck runs like a dream. Gets 20 city and 29.5 highway.
I cleaned my Mass Air Flow, replaced my Idle Air Control, SeaFoamed throttle body and vacuum lines, brand new coil pack, new wires, new plugs, new fuel filter, I've only ever run 91 octane, Chevron with Techron goes in at every oil change and B12 every other and I just ran 3 bottles of Lucas fuel injector cleaner.
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Steam out the tail pipe, misfire codes, rough idle. No water in oil, no over heating. Head gasket ??
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I bought this from my brother in better than mint condition. Always maintained. Its generating a cyl #2 misfire code.
It starts and runs like new when cold, but when it warms up, it idles rough, and generates the code. after 1500 rpm it smooths right out and runs fine.
He had it to the dealer just before I bought it and they told him needed a new engine.
I am thinking bad injector, since what seems to be happening is, when cold it gets more fuel, or when u rev it gets more fuel, but at an idle and warm, it doesn't seem to be getting enough maybe. And I see from the maintenance records, a couple of other injectors have been replaced as well.
I think the dealer got tired of replacing injectors under warranty and tried to milk him for a new engine.
2002 ranger extended cab 2wd, 3 door, 232,000 kms 5 speed 3 liter V6, new glass and clutch..
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2000 4.2....Last year I had to replace the coil pack when it started running rough and had a code for a misfire on cylinder 3. It is doing the exact same thing now, same code, same cylinder. Is there something wrong that is causing this?
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I have a 2003 ranger and have had ongoing problems with misfire cylinder six and have had three different mechanics diagnose the problem as a bad ground. I have replaced all plugs, wires, coil pack, injectors and am constantly pulling the plug on cylinder six, cleaning and often replacing, I also disconnect the battery so it resets the check engine light and it runs fine for about 100 miles and starts running rough again and on goes the check engine light. I have 134000 miles and have maintained it since new.....
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1990 Bronco II, 2.9l, auto, 4x4. Was running just fine. Sitting in Park just idling away. All of a sudden, just starts running real rough, ticking, etc.
Towed it home. This morning, started up OK but still running really rough.
While running, pulled spark plug wires one at a time from the drivers side. Had no effect but could tell the wires were sparking as I held them up to metal.
Turned truck off. Drivers side exhaust manifold COLD, passenger side HOT.
This sounds real bad to me. Am I missing something simple that could cause the drivers side of the engine to not work?
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My 1986 Ranger 2.9 starts only when I spray starter fluid into the air intake. It does stay running and it drives fine. The engine will not fire up unless I do this process. I have cleaned out the fuel rail, fuel injectors, purchased new fuel filter, and tested fuel pressure (which is good).
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i have a 1986 ford ranger with a bored out 2.9 v6 that is not getting spark sent to the spark plugs disrtibutor has been changed along with spark plug wires any clue what the problem is
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I have heard from a few people that it might be the computer that is messed up. Just replaced cap and rotor, spark plugs, wires, fuel filters. Pump turns on. Cranks and cranks but won't start. Took the intake cover off and tried starting it, all it did was back fire. Checked the firing order and everything is right. So im left with guessing at the computer and ignition??
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