Engine Mechanical problem
1998 GMC Jimmy 4 cyl Four Wheel Drive Automatic 176000 miles
My truck will turn over but will not start usually. I can get it to start by persistence occasionally but some days not at all (usually cold days). In the past I could get it to start by receiving a jump but lately that won't work. If it can get started then it runs strong and well with the exception of rough idling.
The following has been checked/tested:
1. Engine Control Modulator- Removed and tested- works fine
2. Distributor Cap- Removed and is ok
3. Firing Order- Appears to be set ok
4. Diagnostic reveals Battery, Cables and Starter ok
The following parts have been replaced:
3 Battery Cables
4. Spark Plugs- spaced correctly.
6. Fuel Filter
7. Intake Manifold- Paid to have it replaced but a friend says it looks as if it wasn't replaced but cannot confirm.
The following problems are known to exist:
1. Idles rough- was told this is a timing chain issue but the timing chain is difficult to fix?
2. Turn Signal Switch Short- The Turn Signal has a short in the wire somewhere which has been causing an intermittent clicking sound under the dashboard. The Turn Signal works fine for both the back right and left tail lights regardless of the short.
3. Alarm Wire Cut- The Alarm Wire was cut but a friend supposedly dismantled the wire so that it wouldn't drain the battery any longer.
The Diagnostic Trouble Codes have been identified:
P0304 Cylinder 4 Misfire Detected
P0507 Idle Control System RPM Higher Than Expected
P1509 IAC System High RPM
If the 'computer' was a problem then supposedly the truck wouldn't start at all.
The Fuel Pump can be heard running. There appears to be no leaks. After the Fuel Filter was installed the Gas Gauge Needle started to move up and down a bit but not violently or irradically.
Could it be a Fuel Pressure Regulator Issue or maybe a another issue?
Nevertheless I am completely frustrated as I have been getting jumps for over four months and no one can diagnose the problem correctly. I am a single mom and do not have the money to take it to the GMC dealer. How do I know if they will tack on more fees for supposed 'newly' diagnosed problems without focussing to diagnose the problem for which I submitted the truck in the first place.
Any assistance is greatly appreciated.
have the same problem?
Saturday, March 20th, 2010 AT 7:07 PM