No Question about the vacuum on my '99 3800. So do we just tear it down and inspect the parts? Is there a way to be sure about cracks in the manifold beyond visual inspection?

misterswizzo
25

Asked by misterswizzo Dec 17, 2012 at 11:29 AM about the 1999 Pontiac Bonneville 4 Dr SLE Sedan

Question type: Maintenance & Repair

Vacuum at oil filler
PCV is OK

3 Answers

John Saffrahn
15,655

There is a way to have both the heads and the intake tested to see what is leaking for sure but they will have to be removed. If you can't see anything visually once removed then having them tested will be a last resort.

TonytheWoodsman
955

Is it a strong vacuum? I would first try disconnecting hoses from the crank case one by one to see if that stops the vacuum. There has to be some vacuum to pull the piston blow-by gases back to the combustion chambers, to re-burn those gases.

John Saffrahn
15,655

Only one hose to the crank and that's the PCV and it runs to the intake hose. No manifold vacuum unless they changed something that has been working fine and efficient forever.

Your Answer

Add photo

Related Questions

Bonneville
Looking for a Used Bonneville in your area?
CarGurus has 1,069 nationwide Bonneville listings starting at $1,500.
ZIP:

Search Pontiac Bonneville Questions

Pontiac Bonneville Experts

#1 dandyoun
dandyoun
Reputation 190
#2 ticklemedaly
ticklemedaly
Reputation 170
#3 John Saffrahn
John Saffrahn
Reputation 160
View All

Related Models For Sale

Used Pontiac Grand Prix"
193 Great Deals out of 5,231 listings starting at $1,700
Used Chevrolet Impala"
1,756 Great Deals out of 55,005 listings starting at $999
Used Pontiac Grand Am"
55 Great Deals out of 2,489 listings starting at $1,400
Used Buick Park Avenue"
19 Great Deals out of 799 listings starting at $1,777
Used Buick Regal"
278 Great Deals out of 9,986 listings starting at $500
Used Buick LeSabre"
101 Great Deals out of 3,308 listings starting at $995
Used Nissan Maxima"
690 Great Deals out of 19,329 listings starting at $946
Used Chevrolet Monte Carlo"
76 Great Deals out of 2,347 listings starting at $1,250
Used Pontiac Firebird"
22 Great Deals out of 784 listings starting at $2,488
Used Chrysler 300M"
13 Great Deals out of 535 listings starting at $800

Used Cars For Sale

2005 Pontiac Bonneville For Sale
12 Great Deals out of 163 listings starting at $2,999
2004 Pontiac Bonneville For Sale
11 Great Deals out of 145 listings starting at $2,699
2003 Pontiac Bonneville For Sale
6 Great Deals out of 162 listings starting at $1,893
2002 Pontiac Bonneville For Sale
10 Great Deals out of 141 listings starting at $1,500
2001 Pontiac Bonneville For Sale
3 Great Deals out of 118 listings starting at $1,500