White smoke issue

chandlerhayes01 · Apr 15, 2024

Recently had white smoke pouring out of the passenger side tail pipe and a rough idle. Checked the coolant and it keeps showing low after being driven. The motor hasn’t overheating yet according to the gauge. Could this just be an intake manifold gasket? What other things should I be looking at?

Thanks

OR VietVet · Apr 15, 2024

It would help to know exactly what you are driving and engine info. BUT, it sounds like a head gasket problem. A compression test, both sides, can help pin down.

chandlerhayes01 · Apr 15, 2024

1996 Tahoe. 5.7 vortec. My apologies

OR VietVet · Apr 15, 2024

chandlerhayes01 said:
1996 Tahoe. 5.7 vortec. My apologies

Thanks for vehicle info. My recommendation still stands for a compression test on both sides. You can rent compression test tools at parts stores. Make sure all plugs are out when doing the test.

NickTransmissions · Apr 15, 2024

chandlerhayes01 said:
Recently had white smoke pouring out of the passenger side tail pipe and a rough idle. Checked the coolant and it keeps showing low after being driven. The motor hasn’t overheating yet according to the gauge. Could this just be an intake manifold gasket? What other things should I be looking at?

Thanks

In addition to the dry/wet compression test, also do a block test that confirms/denies presence of hydrocarbons in your engine coolant. If confirmed, time to yank and go through the heads. If engine has more than 140-150k or so, yank and overhaul it, if you determine head gaskets are needed.

The block test kits are avail at auto parts stores and on Amazon

89Suburban · Apr 15, 2024

Cracked head also a possibility. I had to deal with that.

Eman85 · Apr 15, 2024

Pull the plugs, the one that is clean is the cylinder or cylinders with the problem. Steam is a great spark plug cleaner. Do a compression test and or do a coolant system pressure test. While the coolant system is under pressure and the plugs are out have someone turn the engine over with the starter while you watch. Don't stand in front of the spark plug holes.

Lonny · Apr 16, 2024

Hi team -

Just heard back from the GMC dealership with the diagnosis: they discovered that the connector hoses are leaking. It's a $3,000 job that will fortunately be covered by warranty. I should have some more information later from them today or tomorrow.

OR VietVet · Apr 16, 2024

What connector hoses to where causes white smoke "out" of a tailpipe? That diagnosis explanation is lacking.

Lonny · Apr 16, 2024

OR VietVet said:
What connector hoses to where causes white smoke "out" of a tailpipe? That diagnosis explanation is lacking.

It appears my name was mistakenly tagged somewhere in this thread and caused me to post a reply that belongs in another discussion.

White smoke issue

chandlerhayes01

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OR VietVet

Multnomah Falls

chandlerhayes01

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OR VietVet

Multnomah Falls

NickTransmissions

Sin City

89Suburban

Bull in the china shop

Eman85

Full Access Member

Lonny

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OR VietVet

Multnomah Falls

Lonny

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