Having a bit of an issue with my Silvertop.
For the last 6 - 8 weeks, I've had an intermittent drop in revs, making the car run richer than Bill Gates & sound like a filthy Subaru on it's death bed, for no apparent reason..
It can happen while driving, at any revs & any speed, or even while stopped & idling.
On idle, it would be at 600 - 800 rpm.
Once it hits, it sticks & stays, until the car is turned off & left for 3-4 or more hours.
At first, I was able to get it to go away sometimes by putting the boot into it, making it stutter & snap out of it. Now, it just shudders along like a bitch, no matter how hard I try..
It used to be totally unpredictable & intermittent. But now it seems to always hit after 15 - 20mins, regardless of temperature, weather conditions, revs, driving style, stops/starts ect.
My first thoughts were coilpacks, spark plugs or fuel filter.. But all along, I've been leaning towards something electrical, because of the way it just happens - It can be running beautiful, then all of a sudden feel like its running on 4 or 5 cylinders.
I replaced my non-gapped Irridium plugs with standard RB30 ones. Put on a new fuel filter.
The car starts quicker & idles slightly better, but still had the problem.
Me & a mate taped up my coilpacks, to temporarily stop them arching out, if they were.
Made no difference either.
I unplugged my AFM while idling, the car stalled. Started it while still unplugged, coughed & spluttered & slowly picked up revs until it was idling smooth at about 2000 rpm. Plugged it in, revs dropped to 600 again..
Got a good condition S1 R33 AFM off another mate, (which is rediculously clean internally, compared to mine) put that in tonight.
No difference. I can still unplug it & have the revs smooth & raise up to 2000 - 2200.
I've checked the crank sensor plug, all coilpack plugs, igniter plugs & grounds, & the AFM plug itself. Wiggling & pushing ect.
I checked the ECU, getting error 55, which = No Fault or No Malfunction. Reset the system with the batt & brake pedal method, checked again, 55 still.. Although I havnt driven it since the reset or the new AFM.
I will know in the morning when I drive to work.
Anyone have any ideas?
Any help at all would be much appreciated guys.
Thanks.