Question-------------------------
Followup To
Question -
Has my '88 Corsica jumped timing, or where would you look ? 2.8 Liter, port injection, 197,000 miles. V-6, of course. Automatic transaxle, with air.
It just suddenly refused to start one evening after I parked it, and I had a great evening of Bingo. Motor turns over just great, and it even coughs a little at first when turning over.... The coughing stops if I keep trying. Thinking I probably had a fuel problem I have installed a known good fuel pump, filter, and fuel regulator, AND injectors from another known running spare 1988 corsica. I did this because the fuel pressure at the Schrader valve was very low, and just dribbled out when relieved. Now the fuel shoots out with force. That didn't fix the problem, however. The fuse for the ECM and injectors is good. I put a timing light on two of the plugs, including number one, and the timing marks line up perfect. The timing mark is surprisingly steady for that old of a car. So I know it's getting spark. It didn't dawn on me until later that the timing mark on the crankshaft could be "right on" and yet the camshaft could be off if the chain has jumped timing. Any suggestions ? I don't want to tackle changing the timing chain if there is any other item that might be the problem. Any sensors that might still stop the motor from starting and running ? Thank you !
Answer -
Hello Dwayne, This problem might just a bad computer (ECM). I would spray some carb cleaner into the air intake tube and see if it runs for a little bit. Do this while the engine is cranking over, if it runs at all you will know the timing chain is good. If it runs swap the ECM from your parts unit to what happens.
Let me know what happens
Mark
Mark - - - The spray only produced a big backfire, then a little of the usual coughing, and nothing else. I exchanged the ECM and still had the same results as before the exchange. I have now taken most of the front of the engine apart, as I am practically positive it's the timing chain. Do you have any other suggestions ? Thanks.
Dwayne -- - - - - dwayne1943@yahoo.com OR Yahoo IM as dwayne1943
AnswerHi Dwayne, Well you might as well continue to inspect and replace the timing chain and gears. This could be your problem, I don't see to many cars with high mileage at the dealer. Most of the time when a timing chain goes bad the engine will crank over very fast and doesn't have a compression sound to it. Just a steady cranking noise. Check out the chain and let me know what you find.
Mark
