New rebuilt engine rod knock sound only 75 miles broken in

**RideWithPride** · 06-06-2012

So i just got my car back about 2 days ago from being in the shop for almost 5 weeks

Brung it in for rod knock after all was said and done the engine had to be replaced so we ordered and had a rebuilt engine installed.

Now after about 75 miles breaking it in a light rod knock sound is heard.

Any ideas?

Although i want to mention when i filled up my tank it was almost empty but as i pumped like 2 dollars of gas in it shut off the pump and i had to keep re pressing the pump trigger like 8 different times to fill up 3/4 full tank so possible gas pressure issue?

-91 octane not low 87 or anything like that

**matt5112** · 06-06-2012

They built it wrong and it died again?

**RideWithPride** · 06-06-2012

It didn't die i just dont want to drive on a rod knock to make the problem worse i just wanna know if that's not the final case.
Also i have heard that cracked flexplates make similar noises?

**gtpeddie** · 06-06-2012

did they give you a warranty it was only 75 miles they should cover that

**RideWithPride** · 06-06-2012

It was a private mechanic so i don't know.

**jakechil101** · 06-06-2012

take it back, and ask? the shop ive been takin my cars to for several years, effed up my head gasket on my honda when they rebuilt it, and the fixed it for free

**RideWithPride** · 06-06-2012

Thank you all for advice as of returning the engine but i need to use my car in the morning so i just wanted to see if their was something that might sound similar to rod knock

**Scottydoggs** · 06-06-2012

the engine was bought from a engine re builder? or the shop rebuilt it?

if it was bought as a re built engine it should have some kind of warranty, sadly most of the time the labor is not covered.

**gtpeddie** · 06-06-2012

and labor is usually more money then the parts, average mechanic charges like $85 an hour

**blueguy** · 06-07-2012

Probably didn't have it line bored...once the mains come off, it is crucial.

**copgtp** · 06-07-2012

Originally Posted by RideWithPride

Thank you all for advice as of returning the engine but i need to use my car in the morning so i just wanted to see if their was something that might sound similar to rod knock

Okay, how about this.

You have a major engine and/or flex plate failure, you should not drive the vehicle, you will make it worse.

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**RideWithPride** · 06-08-2012

Note/update to all reading this, unfortunate i guess these fourmers don't have to much experience on this specific issue.
Taken it to the shop said off the bat might be a simple timing issue.
Will keep you guys updated!

**Fivefingerdeathpunch** · 06-08-2012

How could it be a simple timing issue?

All you have to do is line up on the marks on the crank and cam gears.

The timing is controlled via the PCM, so if both those marks are in the right spot, the pcm does everything.

**darkhorizon** · 06-08-2012

The blower can make a random knock at idle....

Other than that the only knocking noise you could have would be rod knock... its common as many 3800s are rebuilt incorrectly.

**BillBoost37** · 06-08-2012

Originally Posted by RideWithPride

unfortunate i guess these fourmers don't have to much experience on this specific issue.

Note to you sir: It appears you and your builder may not have much experience on these engines since you think it's the type of thing that happens to older engines where timing is adjustable by turning a distributor. This is one of the worlds simplest engines to work on, right up until you try and rebuild one. Then you better know the motor and it's quirks.

On this forum... we know these motors and their issues. A large majority of the time... we can diagnose them over the internet with very little information.

PS: fourmers? Forum folks, forumer's..

Thread: New rebuilt engine rod knock sound only 75 miles broken in

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