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Old 02-27-2002, 23:18   #1 (permalink)
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EF 6 will not rev above 3500 RPM

I have this problem with my EF 4.0L 5 speed manual wagon. When I am in 2nd thru to 5th gears the engine will not rev above 3500 RPM, but in 1st or neutral it will go all the way to 5500. I have had all sorts of "experts" look at it, but no answers. I have changed the CPU, and a number of other components, but I still have the same problem. Any one have any ideas???
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Old 02-28-2002, 02:02   #2 (permalink)
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it`s a longshot but have u checked the catylitic conververtor ?
good luck !
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Old 02-28-2002, 02:41   #3 (permalink)
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It would be worth checking cylinder compressions and then if you can borrow a coil pack from somewhere that would be worth trying as well - but then a dyno-tune place would be your best bet because they can check out mixtures and ignition quality and timing etc. under load conditions.
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Old 02-28-2002, 03:39   #4 (permalink)
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spark plug leads?? Fuel pump & filter check presure..Air filter ??Good earth's Battery terminal's,vacuum tube to map & m.a.p .. o/k ??
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Old 02-28-2002, 05:30   #5 (permalink)
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what about neutral/clutch switches...maybe a long shot, but anythings worth trying i guess.
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Old 02-28-2002, 12:13   #6 (permalink)
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Thanks for your responces you blokes. Some of the things I have had done included: compression testing, all ok. new fuel filter, leads, plugs. I did make the mistake of taking it to a Ford dealer, 2 days and $600.00 later all they could come up with was, put a new engine in. I have had all the parts check that you blokes listed, and they are all OK. I have just moved from WA to QLD, so if anyone knows of a good place to take it in Townsville let me know.
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Old 02-28-2002, 14:23   #7 (permalink)
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Is it a fuel cutout issue, ie does the engine cut back at 3500 rpm, or is it the engine hasn't got enough guts to get past 3500rpm, ie does it surge, drop back, surge, drop back..... or just stop increasing revs?

3500 rpm is suspiciously close to the manifold changeover point for the short runners, could be something to do with this??
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Old 02-28-2002, 14:32   #8 (permalink)
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Jesmol, the engine cuts out at 3500, just like it's hitting a rev limiter. I have asked the same question about the changer over point from short to long runners, but I was told that would not cause the problem. I don't get it, in first it will easily rev to 5500 red line (I don't make a habit of doing this) and in neutral, but when there is more load on the engine (in 2nd gear or above) it cuts out at 3500.
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Old 02-28-2002, 16:27   #9 (permalink)
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If its a hard cut out at 3500rpm, then its probably ECU related.

Could be some sort of false signal from Vehicle Speed Sensor casuing fuel cutoff, or maybe the fuel pump itself cannot deliver enoough fuel under load, might pay to try and attach a fuel pressure gauge and check pressure under load??

Sounds like an interesting / frustrating problem to deal with. Good Luck!!
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Old 02-28-2002, 16:37   #10 (permalink)
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It's going in for a service soon, so I will get them to check the fuel pump. Hopefully it is something simple. If I get it fixed I will let you bloke know. I really miss the looks on the boy racers faces when my stock standard EF wagon leaves there V6 crumbledores behind at the lights.
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