Bad Rattling Noise

93gMc_nv4500 · May 4, 2022

I recently swapped the intake on my 93 gmc 5.7 Tbi due to the common heater hose connector corroding. After the first start up the rattling started. The truck will fire up and run like crap and rattle like crazy. Just wondering if it’s timing chain or more serious. I checked oil pressure with a manual gage just to be sure and I have good pressure. Just wondering if that sounds familiar to anyone. Also it never made that noise until I swapped intakes.

GMCTRUCKS · May 12, 2022

Make sure the new intake has all the same holes for the heads and so on put back the other intake

RichLo · May 12, 2022

Hopefully you didnt leave any tools in there.

The only thing that may cause a rattle during an intake swap is something came loose on the distributor during the swap?

Schurkey · May 12, 2022

I don't understand why you'd go to the time, money, effort, and enthusiasm to change intake manifolds to repair a failed heater hose connection.

What intake did you install? Another OEM GM TBI unit, or some aftermarket intake?

Runs like crap, and rattles? Timing set properly? Tools left in the lifter valley? Vacuum leaks including a messed-up PCV valve? Broken spark plug porcelain causing misfire and compression loss?

Connect a scan tool, look at the data stream. Fuel trims, MAP sensor and knock sensor readouts would be the first things I'd look at...but look at ALL the sensor data and computer outputs.

Bad Rattling Noise

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