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ds442
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Registered: 04/02/18
Posts: 374
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Ford Ranger problems
#25309331 - 07/05/18 06:25 AM (5 years, 6 months ago) |
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My neighbor has a 2003 Ford Ranger. 6 cyl. not sure what one. So I checked the codes last night but didn't write them down. 4 5 6 cyl. misfires. Rich and lean codes on the same bank Im pretty sure. Im thinking it's bad valves or head gasket. Possibly an intake leak. It has 240,000 so the head is probably bad. He is working so I can't look at it till tonight. The rich and lean on the same bank is definitely caused by a misfire. Any thoughts?
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LogicaL Chaos
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Re: Ford Ranger problems [Re: ds442]
#25309384 - 07/05/18 07:45 AM (5 years, 6 months ago) |
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Maybe the timing belt is off?
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HappyHigh
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sounds to me like you need to clean your MAF and your IAC. still backfires then check electrical connections at all the damn sensors on the intake manifold. then try testing at the MAF and IAC connections with tool. Also check vac lines there are freaking 5-10 of them running just to a/c they can get old and crack. all of these can cause those issues and normally it's more than one.
-------------------- Had I the heavens' embroidered cloths, Enwrought with golden and silver light, The blue and the dim and the dark cloths Of night and light and the half light, I would spread the cloths under your feet: But I, being poor, have only my dreams; I have spread my dreams under your feet; Tread softly because you tread on my dreams.
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ds442
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Registered: 04/02/18
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Re: Ford Ranger problems [Re: HappyHigh]
#25309587 - 07/05/18 10:14 AM (5 years, 6 months ago) |
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But it's only having issues on the one side of the motor. Timing belt would mess up both sides as well as the maf. I don't really think it's a vacuum leak but maybe. Also I was thinking not the valves because all 3 cylinders are missing. It could be a catalytic converter clogged or melted. i had that happen to me before. He just told me it will only go to 60 and that's it.
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LogicaL Chaos
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Registered: 05/12/07
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Re: Ford Ranger problems [Re: ds442]
#25310618 - 07/05/18 08:17 PM (5 years, 6 months ago) |
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Maybe one side of the head gasket is bad causing a loss in compression.
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HappyHigh
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Registered: 05/05/17
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all these dam plastic parts you never know I had same issue on driver side turned out my head cover had a small crack on the side that faces firewall. took removal of motor for me to find it. Yes guy above me is right I currently have a driver side cyn 8 blown head gasket and I hear noise. and I got a 4.6 sohc so Im dreading dealing with that timing chain again...
-------------------- Had I the heavens' embroidered cloths, Enwrought with golden and silver light, The blue and the dim and the dark cloths Of night and light and the half light, I would spread the cloths under your feet: But I, being poor, have only my dreams; I have spread my dreams under your feet; Tread softly because you tread on my dreams.
Edited by HappyHigh (07/06/18 04:12 AM)
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TheUpsideDown
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Re: Ford Ranger problems [Re: HappyHigh]
#25312893 - 07/07/18 06:45 AM (5 years, 6 months ago) |
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Sounds like coil pack failure. 4.0 Ford's coil pack controls 4 5 6 cylinder on the same side of the coil pack.
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christopera
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Start by searching the codes via google. No point in speculating.
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rackem



Registered: 11/27/09
Posts: 14,024
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Quote:
TheUpsideDown said: Sounds like coil pack failure. 4.0 Ford's coil pack controls 4 5 6 cylinder on the same side of the coil pack.
this was my first thought as well
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Humble Newcomer
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Registered: 03/12/17
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Re: Ford Ranger problems [Re: rackem]
#25375488 - 08/08/18 05:00 PM (5 years, 5 months ago) |
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Do you fix it DS? Sorry I didn't see this. Your thoughts are all very spot on, very good troubleshooting direction Not many people would think of a restricted exhaust either, that's sharp, I actually had that one time on a box truck it wouldn't go over 55, from half throttle to full throttle was all the same, no misfire that I recall i don't remember it shaking or getting worse as i floored it, i seem to recall it just beinf spongy, no response.
Depending on the ignition system it could be ignition, I've seen coil packs that feed two cylinders so a bad coil can make two cylinders bad but I'm not sure if I've seen an ignition system that could cause all three to go bad on one bank, unless irs older and then it would cause them all on both banks to go bad. Edit - UpsideDown seems sure of himself amd i don't doubt it, it was a Ford i was thinking of that had the one coil pack for two or all four cylinders, i think just two. If this is true, its where i would start. If it is one coil pack per bank just swap coils from bank to bank, clear codes, drive it, see if it follows.
Also, I'm wondering now if it maybe has two issues, because if it is misfiring that would set codes and cause drivability issues. But ir won't restrict vehicle speed.
Likewise a restricted exhaust will limit speed but I'm remembering back to that vox truck amd thinking it thru i don't think a restricted exhaust will cause misfiring.
You floor it, the throttle body opens wide open but because the cylinder can't evacuate all the exhaust gas, there is little to no engine vacuum to pull in your fuel air charge. So even though I was flooring it in that box truck i was pulling in the same amount of air fuel charge as half throttle. Air fuel ratio swouldn't be changed too much i wouldn't think, ans the ignition system follows rpm so that's fine. Yeah I'm not sure that would cause any symtpom except restricted road speed.
Many people know that the Piston pushes exhaust out of the cylinder while traveling upwards on exhaust stroke, but they may not know that valve timing makes it such that when the exhaust valve starts to open the Piston is usually already on the upstroke and so when the cam opens the valve there is a literal "puff" of pressure differential that causes most of the exhaust to flow. The Piston merely pushes out the remainder. In a restricted exhaust system the pressure inside the cylinder is no longer higher than the pressure of the exhaust system amd so there's ko differential flowing the gas. If all the work was done by the piston vehicles would never have this issue. Can be checked by drilling small hole pre cat and post cat amd checking. That engine may have one for each bank though, if that's the case they should be replaced as a pair if one is the culprit
EDIT - unless the transmission is in failsafe mode. Not likely, but in a major transmission failure most lock you into second gear. But I assume the driver would notice a slower acceleration and lack of an upshift.
Edited by Humble Newcomer (08/08/18 06:09 PM)
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