Ask Bob: VW Losing Power

by Bob DeP.


Dear Bob,
I have 1985 VW Jetta Car, which has about 120,000 miles on the 1.8 liter engine. The problem I just notice is that I am seeing a lot of black smoke coming out the exhaust pipe and I am also noticing a decrease in power when I accelerate. A couple of months ago I changed plugs and wires and rotor cap. What's wrong? Would a compression check tell me more? If yes to the last question , what thing am I looking for and what does it mean. Any advice would be most appreciated.
Kyle

Kyle,
When doing a compression check, you want all of the cylinders to be within 10 percent of each other. If you have a low one, then it could be bad valves or rings. You would need to do a leak down test to further diagnose it. But, I think that the problem may lie with the computer. Did the check engine light come on? Has the oxygen sensor ever been replaced? The car may be stuck in a rich mode allowing more gas to be consumed than necessary.
Good Luck!
Drive Safely!
Bob, The Auto Answer Man


Have a car care question? Visit our automotive center and see if we've already answered it or a similar question.

Stay Connected with TDS






TDS Pinner Of The Month




Subscribe to TDS Newsletters

Join over 250,000 other subscribers!

Join Fido!

Discounted movie tickets
Sign up for Savvy Savings at TDS and get a free membership for discounted movie tickets!

Your Email:


The Dollar Stretcher
Dollar Stretcher Parents
Dollar Stretcher Tips
Surviving Tough Times
Financial Independence
The Computer Lady
Computer Lady Lessons
Healthy Foods

Your Email:


View the TDS Privacy Policy.