ENGINE VIBRATION

1998 Acura Integra

Tiny

dgie

September, 3, 2008 AT 10:42 AM

Engine Performance problem
1998 Acura Integra 4 cyl Front Wheel Drive Manual 380000 miles

I just rebuilt the engine in my integra using the Helms manual. When I pulled the pistons I did not keep track of them and got them mixed up. So I installed them back in, in any cylinder. The engine was honed and the pistons are the same oem, I used after market main bearings, rod bearings and rings. I so far have 800 miles on it, mostly highway miles (found out that constant speeds are not good for break in, too late) anyways I have a high frequency vibration, that I am picking up from the engine. Could this be from mixing the pistons up and maybe the engine is out of balance or should I look elsewhere? I did a compression check even though the engine has only 800 miles since rebuild and have 125 psi in all cylinders.

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3 Answers

Tiny

KHLow2008

September, 4, 2008 AT 8:31 AM

Hi dgie,

125 psi is too low for the engine.
The vibration should not be from the mixup of the pistons, I would suspect impropr valve timing, cause by wrong camshaft timng when installing the timing belt.

Tiny

dgie

September, 4, 2008 AT 3:35 PM

Thanks for the response, I have around 800 miles on it since rebuild and mostly highway miles. Could this have given me a bad break in? Or will the compression get better the more I drive it? If not do I need to re-hone re- ring the motor and start over?

Tiny

KHLow2008

September, 5, 2008 AT 7:15 AM

No, I would not recommend honing the cylinders.

Do a wet compression test and see if the compression increases.

If you had the vibration after the rebuild, I would suggest checking the timing belt synchronization of the crank and cam shafts.

Check the ignition timing too. Is there any power loss compared to before rebuild?

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