Hi everyone! I have a 6 cylinder, 2WD, 1996 GMC Jimmy. I'm the original owner and have faithfully changed the oil, and all filters, at 3,000 mile intervals. My Jimmy has the original engine and automatic transmission. I have just reached
345,000 and I've been told that I need a "valve job" due to a ack of compression in two valves.When I took my car to my mechanic I was sure that he was going to say that it was a transmission issue. Let me explain: yesterday when I was driving up a small grade it felt as if I was towing a trailer. My engine revved up but felt as if it wasn't changing gears. It strained to go from 1st gear to a higher gear. I normally drive on 'overdrive' and it's always shifted smoothly. So, my immediate thought was a transmission problem. I know about the 'limping' setting that can occur with GMC trannies and I thought for sure that when my mechanic checked for the code that the transmission issue would show itself. Oh, I was able to drive it for the rest of the day without the 'problem' recurring.
So here's the question....does this sound like a 'valve' issue? He told me that I need to have a 'valve' job. He sad that the compression was bad. I've always trusted him, he's worked on my car for many years but given the $1,600+ cost I'm trying to do the right thing. I've planned on keeping my Jimmy for several more years. How can I be sure that I need a 'valve job'.
Thank you for your opinions and expertise....it is greatly appreciated!