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Old 09-28-2002, 02:13   #1 (permalink)
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my dyno run...bugger...

well i got my car dynoed this morning, i have thought since i bought it that it wasnt running properly or making as much power as it should, and this was finally backed up by the dyno run.

i just wanted a power run to see the air/fuel ratio and spark advance as well as max hp, so no real diagnosis was performed.

the results, well, im happy i know what is wrong, but i dont know what is wrong, if you know what i mean...

the richest air/fuel ratio we could get was 14:1, which is not rich at all, it should be like 12.5:1 or so. so i know why it is crap, but i dont know why there is so little fuel getting into the motor - all the mechanical aspects of the fuel delivery system are in good nick, so the only things left are the sensors and or wiring...this sucks...

so the best the silly thing could put out was 133hp at about 3000rpm - the power curve went slowly up there, flattened out at about 3000-3500 and then dropped like a sack of poo after that.

i couldnt get a dyno video this time due to WH&S, and i didnt bother with a printout.

so if anybody has some really good ideas why my car wont richen up please post them here, we already checked the fuel pressure regulator and i have checked the MAP sensor wiring for power and earth, all ok.

the manual says that the voltage across the two terminals on the coolant temp sensor should be 5V, but i only get 4.6 - would this have such a huge effect? what are the correct voltages for the throttle position sensor?

any info appreciated, thanks in advance...
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Old 09-28-2002, 02:43   #2 (permalink)
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So you have done the required fuel pressure tests to elimate the pump, filter and regulator? In any event, I would try changing the filter as a cheap approach if you haven't already done so. I would also run some injector cleaner through it.
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Old 09-28-2002, 02:45   #3 (permalink)
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I assume that it hasn't just had a head job and that someone hasn't put in a CFI inlet gasket instead of a MPEFI one (I'm assuming its MPEFI).
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Old 09-28-2002, 02:51   #4 (permalink)
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Old 09-28-2002, 06:06   #5 (permalink)
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no it has been doing this since i bought it, and the owner reckoned the head has never been off the car.

its not running badly, its just the computer is not richening the mixture when it should, and i dont know why.
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Old 09-28-2002, 10:07   #6 (permalink)
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We have two discussions running on the same subject, I thought I saw this thread in the Garage. Check my reply there.

Wot's goin on!
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