One problem related to gas recirculation valve (egr valve) has been reported for the 1998 Oldsmobile Intrigue. The most recently reported issues are listed below.
While changing oil I noticed a coolant leak, I looked into the leak further and noticed it was leaking from the upper intake and throttle body area. I was informed by a gm tech that there is a problem with these plastic upper intake manifolds on the gm 3800 series ii engines and gm came out with a better quality and reinforced egr port on the replacement manifolds. I had to get another upper intake replaced on my 1998 park Ave at 50,000 miles. Now my 1998 olds Intrigue with 21,000 miles needs replaced. Besides the two that I own, the gm tech that informed me of this problem, also said he had to change the upper intakes on his own vehicles (2) of them. There is definitely a problem defect here and I should be reimbursed.