91 Ranger Timing Chain
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91 Ranger Timing Chain
Is there any way to tell if a 1991 4.0 OHV Ranger with 144,000 has jumped time short of taking the front cover off? The truck died coming off the interstate on an exit ramp and hasn't run since, it cranks, has fuel and fire, no koeo codes, I have replaced the ign. module, coil pack, crank position sensor, and MAF sensor. It just acts like it has "jumped time", turns over fast, you can hear it fire through the exhaust, and every now and then it backfires through the intake, When I pull the plugs they are really gas soaked, like it is floodeed. Without a distributor I can't tell if it has jumped, and would hate to tear it down to find nothing is wrong.......... With limited experience on this engine I don't have a clue if it's known for the chain to jump a tooth or two as they get a lot of miles on them.
Any help would be greatly appreciated, as I need to get it going for work.<O
</O
Any help would be greatly appreciated, as I need to get it going for work.<O
</O
Last edited by 1nisam1; Jul 6, 2007 at 06:30 AM. Reason: left some thing out
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From: St. Peter
You would probably still get it to run with a bad FPR. Seriously though, this would be the easiest way. Buy a timing light and hook it up. You can unplug a connector near the DIS and it will go to its base timing, and you can see if it is correct. Or do a compression test. If it has skipped a tooth it will loose compression.
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From: Manitoba Canada
Ok, to check if your timing chain has jumped, remove the valve cover that relates to #1 cylinder. Rotate the engine to the point where valve overlap is occurring on cylinder #1. Once you have that part done, look down on the passenger side front of the engine. Even though there is no distributor, the factory put a timing pointer and mark on the vibration dampener. If the lines line up, your not having a timing issue. I hope this clears things up for you. If you can't find the pointer due to someone removing it, just pull the spark plug on cylinder #1 and insert a screw driver inside and feel for the piston. the valves should be doing the overlap thing just as the piston is in it's transition stage from going up to going down. Good luck. Oh... just so you know, I have over 400,000 on my 4.0 and it has never had the timing gears and chain replaced.
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From: Aurora
Originally Posted by F150 hybred
just so you know, I have over 400,000 on my 4.0 and it has never had the timing gears and chain replaced.
Sounds like F150 hybred's method is easy enough, and we'd like to hear what you find, but you might check wiring like your grounds. Also, check your connections to the PCM for corrosion.
Fred
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valve timing check
The quickest way to determin if the valves are timed is to do a compression check. With the valves out of time your compression will be LOW. Did I hear you say that it seems to crank over really fast? Much faster than it used to? That might be a clue that the comp is low.
John
John
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From: Manitoba Canada
Thanks Fred... as far as upkeep, the only thing I can say is I am religious on upkeep. Every 3000 it gets an oil change. Nothing special either. Just good old "Jed Klampet" oil is all. It is a great truck.... other than the weak *** transmission in it. Gotta hate those A4LD transmissions. I can honestly say that the engine has never been cracked open. When I start it and it's cold, the rockers tick until it's warmed up.... i did the water pump and clutch fan this past month... and other than that, I can't complain considering it's a 4.0. I'm gonna drive it until it won't drive any more. then I'll probably throw a few parts at it and keep it going some more.
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Now this might be a shot in the dark, but pull the pass side kick panel and just make sure the ECU isnt all rusted to **** like mine was, from the windshield leaking all these years. U check Fuses?? Id have to say i doubt the TC has jumped. I was told thats what was wrong with my ranger (3.0L). That it broke. I tore it all down, TC was fine. Threw a new one on anyways. Truck is believed to have 230k on it.
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From: Aurora
Originally Posted by JohnEd
The quickest way to determin if the valves are timed is to do a compression check. With the valves out of time your compression will be LOW. Did I hear you say that it seems to crank over really fast? Much faster than it used to? That might be a clue that the comp is low.
John
John
Its a rare event, but it could have jumped. One method or the other, or both, let us know what you find.
Fred
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Okay, TC is tighter than a banjo string, marks line up, both valves closed when @ TDC,, any body got a good line on a couple of sticks of dynamite......lol
I did notice that when you crank the engine it is blowing air out of the air horn, and on further checking if you put your hand over the exhaust will cranking it creates a serious vacuum, I'm lost..................................
I did notice that when you crank the engine it is blowing air out of the air horn, and on further checking if you put your hand over the exhaust will cranking it creates a serious vacuum, I'm lost..................................
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From: Aurora
????? cranking backwards??? I donno!!!!! Just for shts&giggles, whats the rotation? I can't beleive that the battery reversed polarity and the electrical system would be capable of reverse cranking, but I've never seen them blow out the air horn except on backfire. At this point, you might pull the valve covers and inspect the condition of the upper valve train. Valves might be stuck open.
Fred
Fred