replaced head gaskets 3.8L but I still get water in throttle body

Asked by Aug 27, 2015 at 10:12 AM about the 1999 Pontiac Grand Prix 4 Dr SE Sedan

Question type: Maintenance & Repair

water in throttle body after replacing new head gaskets

4 Answers

81,965

Did you look for cracks when apart?

1 people found this helpful.
81,965

You could have the cooling system pressure checked.

78,085

The plastic upper plenum is cracked. The 3.8s blow intake manifold gaskets (upper and lower). Not head gaskets. When replacing the intake manifold gaskets GM recommends replacing the plastic upper intake manifold assembly (upper plenum) due to cracking. There's a small coolant passage that runs around the throttle body to keep the throttle plate warm and prevent icing in cool damp weather. The 3.8s rarely, if ever, blow a head gasket. HTH. -Jim

81,965

Agree with Js08016

1 people found this helpful.

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