Exhaust manifold replacement instructions

SAMMY1969

MEMBER
2003 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
96,000 MILES

I have a poot poot poot noise coming from the engine, sounds like and exhaust leak. I've narrowed it down to around the spark plug area on drivers side front. It only makes the sound when I start it and continues till its warm then it goes away, but if I stop say at a store and come out and start it up it makes the sound for only a couple minutes. I'm afraid the exhaust manifold has cranked I got a new one but need help installing it. Thanks.

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

You could also just have a exhaust manifold gasket leak. As the engine warms up the leak goes away as the components expands.
When tightening the exhaust manifold bolts it should he done with two passes. First tighten the two center bolts on the exhaust manifold. Then tighten the rest of the bolts alternating from side to side, while working towards the outside bolts.

Install the exhaust manifold bolts. Refer to the following torque sequence:

Tighten to 10 Nm (89 lb in) on the first pass.

Tighten to 20 Nm (15 lb ft) on the final pass.

Here is a helpful video with some good tips:

https://youtu.be/py-rIWATchY

I have attached exhaust manifold replacement procedure for your vehicle.

Please let me know of any questions.

Thank you.

Images (Click to make bigger)