eddymcclements
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| posted on 22/7/06 at 02:59 PM |
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4AGE help needed
Here's the problem:- I set off for work last Friday with the car running perfectly, got about 200 yds and it dropped onto 1 or 2 cylinders. I
limped back home and have tried the following:-
Swapped ECU
Swapped coil
Swapped ignition amplifier
Checked plugs - no 4 was dry, nos 1, 2 & 3 were wet to a greater or lesser extent
Turned over the engine with no 1 plug out and resting on head - fat blue spark.
Cleaned plugs and dried them off with a blowlamp
So, it's getting fuel (I can hear the fuel pump running, the plugs are wet, I can smell unburnt fuel coming out of the exhaust). There's
definitely a spark as far as I can tell.
It's still running the original (off the donor) dizzy cap and rotor arm and I can't get spares on a Saturday so they've not been
swapped. Can either of these fail in such a sudden manner? Both look OK in that they're not cracked or falling apart, but I don't know
what else to check for.
So, what's the problem? I don't have the facilities for a compression test and it seems odd that the failure was so instantaneous, so for
the time being I'm discounting the possibility of head gasket / rings / piston failure (rightly or wrongly).
Anyone got any ideas?
Ta,
Eddy
[Edited on 22-7-2006 by eddymcclements]
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DIY Si
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| posted on 22/7/06 at 03:12 PM |
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Are all 4 plugs sparking or have you just checked number 1?
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Peteff
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| posted on 22/7/06 at 03:44 PM |
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Have you got a fuel filter? What fuel system are you using?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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eddymcclements
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| posted on 22/7/06 at 09:18 PM |
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DIY Si - I know number 4 is OK because a. the plug is dry and b. the exhaust header gets hot. I was time-limited on my investigations, so I just
checked one of the wet plugs to see if it was sparking at all, and it was.
Peteff - I have a nylon gauze pre-filter, Bosch injection pump, EFI post-pump filter, solid lines to the injector rail, stock Toyota FPR with vacuum
hose and solid lines leading back to the tank. I don't suspect the fuel system at the moment because the plugs are getting wet, there unburnt
fuel at the exhaust and I can hear the fuel pump running.
To be honest I think the most likely cause is a faulty EFI sensor, a fractured wire, a problem with the trigger in the dizzy or the cap or the rotor
arm. Or something worse. When the motor dropped from running cleanly to running badly I'd only gone a short distance and had probably only just
shifted into 3rd.
Cheers,
Eddy
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