Engine RPM

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toto mcdonnald - 29 Jun 2005 03:50 GMT

Just got a used engine put on my 99 accord dx and the trouble is the rpm is
pretty high and goes up and down between 1250 to 2000 fluctuate between those
2 numbers. I hope the that mechanic didn't mix up the wires and damaged the
PCU module. Anyone have any idea what could be the cause for this fuctuation
and the reason for being so high.

Thanks in advance

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Ken Bell - 29 Jun 2005 06:58 GMT

>Just got a used engine put on my 99 accord dx and the trouble is the rpm is
>pretty high and goes up and down between 1250 to 2000 fluctuate between those
>2 numbers. I hope the that mechanic didn't mix up the wires and damaged the
>PCU module. Anyone have any idea what could be the cause for this fuctuation
>and the reason for being so high.

It sounds a lot like a vacuum leak. Bad vacuum hoses, or maybe
leaky engine seals, e.g., valve cover gasket, allowing unmetered
air into the fuel mixture. Didn't your mechanic notice this after
installing the engine?

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Ken Bell :: kenbell@panix.com :: (212) 475-4976 (voice)

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toto mcdonnald - 29 Jun 2005 12:45 GMT

tnanks for your reply Ken,
Yes my mechanic notice this after and he is still working on the car but
unable to trace the problem even the diagnostic tool not showing if there is
a sensor or a valve not working properly. also he checked all the hoses and
the connections. but what i didn't like is he was swaping connectors on the
throtel body and my fear is he damaged the powertrain control module.
pleas advise

>>Just got a used engine put on my 99 accord dx and the trouble is the rpm is
>>pretty high and goes up and down between 1250 to 2000 fluctuate between those
[quoted text clipped - 6 lines]
>air into the fuel mixture. Didn't your mechanic notice this after
>installing the engine?

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Ted Mittelstaedt - 30 Jun 2005 10:54 GMT

> tnanks for your reply Ken,
> Yes my mechanic notice this after and he is still working on the car but
[quoted text clipped - 3 lines]
> throtel body and my fear is he damaged the powertrain control module.
> pleas advise

If what he was swapping are the connectors to the TPS then no fear, that is
a simple variable resistor and is not polarized.

Ted

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Don Stauffer - 29 Jun 2005 16:56 GMT

> Just got a used engine put on my 99 accord dx and the trouble is the rpm is
> pretty high and goes up and down between 1250 to 2000 fluctuate between those
[quoted text clipped - 3 lines]
>
> Thanks in advance

If it SOUNDS the same, I'd say the tach is screwed up. If you didn't
change final drive gears the rpm at any speed should be the same
regardless of engine. the fluctuation also seems to make me suspect the
tach. Do you HEAR a fluctuation? The ear is reasonably sensitive to rpm.

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