Last post on Nov 14, 2009 at 9:33 PM
You are in the Subaru Forester Maintenance & Repair
What is this discussion about?
Subaru Forester, SUV
#3 of 32 Re: Subaru Forester 2003 - no power, CEL [xwesx]
May 19, 2009 (4:56 am)
The code pulled indicated a misfire in cylinder 4.
I can kind of replicate with heavy acceleration on startup and the surging happens sooner than at freeway speeds.
I have a compression gauge now (borrowed) and will check the compression as I also change the spark plugs and wires (probably needed anyway - thought I had last put in long-life platinum plugs on last change). For some reason, seems to run better right now (yesterday/today) so maybe something loose also.
#4 of 32 Re: Subaru Forester 2003 - no power, CEL [krc2]
May 19, 2009 (7:21 am)
I'd go in order of cheapest cost first.
Then the ignition coil
If it's not that then it's probably fuel related.
#5 of 32 Re: Subaru Forester 2003 - no power, CEL [krc2]
May 19, 2009 (9:44 am)
I suspect, from your description, that it is spark-related and is the plug wires. Never hurts to replace the plugs, too! If it is not running well, the plugs will foul (even if the problem is not their fault!), then could continue causing problems even after you fix the initial cause.
If it has not been replaced, you might also consider replacing the fuel filter for good measure. It is easy to access and inexpensive to buy.
Hopefully the replaced wires will clear up the problem.
#6 of 32 Re: Subaru Forester 2003 - no power, CEL [xwesx]
May 19, 2009 (11:27 am)
Same here. I had a 93 Miata that ate through spark plug wires every 30k like clockwork.
#7 of 32 Re: Subaru Forester 2003 - no power, CEL [ateixeira]
May 19, 2009 (12:12 pm)
Well, quite embarrassingly, I recently had a problem with my Escort that I was convinced was not plug wires since they were the most recent thing replaced (about 2.5 years ago, but only about 20,000 miles or so on them). I replaced the spark plugs and the problem was gone for about 75 miles, then slowly began to return. I finally decided it was either the ignition coil or fuel pump, but do not have the tools to diagnose either of them. So, I took it to a shop for extensive diagnostics and the final result was bad plug wires. With those replaced, the car runs perfectly again.
#8 of 32 Re: Subaru Forester 2003 - no power, CEL [krc2]
Jul 21, 2009 (7:55 am)
Hi, I have a Forester 2003 2.0L with a similar problem. Has your problem been resolved. My mechanic clipped an oscilliscope to the spark leads from the coil and found a discrepancy. He advised to change the coil. My question is that this fault did not show up on the scanner and no codes came up. Is this possible.
#9 of 32 Re: Subaru Forester 2003 - no power, CEL [forester03]
Jul 22, 2009 (10:37 am)
I changed out the spark plug and wires and tinkered with other things also.
I would also have him check the basics first: transmission oil level (yes - sounds strange), ensure the air filter is properly enclosed with no gaps or openings, spark plug inserted correctly. If you search on google you will find info on the codes.
Also, have him look at the spark plugs themselves - is there any indication of a problem?
If the fault is on one cyclinder, can he change the wires from one to another, or swap the coil to see if the problem moves? I can't remember if there was a separate coil per cyl. or not.
And, finally, of course, a compression test could be in order to validate that the head is ok.
#10 of 32 Re: Subaru Forester 2003 - no power, CEL [krc2]
Jul 27, 2009 (9:49 am)
My 1998 had one single ignition coil. About an $80 part on-line.
#11 of 32 Re: Subaru Forester 2003 - no power, CEL [ateixeira]
Jul 30, 2009 (7:15 pm)
I have replaced the coil, plugs, wires and still my 2003 Subaru is back firing. Was told it may be the valves. What about the timing belt? Love the car but it is getting to be a pain.
#12 of 32 Re: Subaru Forester 2003 - no power, CEL [suebaru]
Jul 31, 2009 (7:53 am)
Time to find a good mechanic. It's nothing simple we could diagnose online, that's for sure. Good luck.