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#1
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running on 4-5 cylinders
so on the way to work the engine just randomly drops cylinders. i do the self diag and get codes 22 28 37 and 14-19. after doing a visual inspection i find that the knock sensor on the left side has a big crack in the housing. i get the new sensor put it in and start the car, no change. i check the codes again now im getting codes 23, 24, and 14-17. i dont know what to do someone please help me
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#2
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Re: running on 4-5 cylinders
Fix the other codes?
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#3
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Re: running on 4-5 cylinders
yea the knock sensor and the o2 sensor codes are gone. not sure where to go from here
Last edited by SVXpress94; 02-20-2012 at 09:37 AM. |
#4
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Re: running on 4-5 cylinders
not sure why it would throw a MAF code after replacing the knock sensor but not before
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#5
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Re: running on 4-5 cylinders
Check the engine grounds. The fuel injectors, knock sensor, and bypass air valve all ground through the engine (not the MAF though). Not sure how likely it is to be the cause of this but it's free/easy to check, so might as well just to rule it out.
What I would do next is test the MAF, by unplugging it prior to starting the car and check if the car runs better or differently. A MAF on the way out can cause some weird behavior. Then clear the codes by unplugging the battery for a while (like 10 mins should do it) and then see what codes come back. Also try it with the MAF unplugged and see how it does (unplugging the battery also causes the ECU to forget some of the things it's learned). When you unplug the MAF obviously it will throw a code for it, so if anytime you do that you should clear the codes so that when you check you will know if the MAF code is because you unplugged it or because it's actually giving a bad reading.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#6
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Re: running on 4-5 cylinders
Check engine coils for wires that have become brittle and possible causing issues. I had a coil do this to me and would randomly lose a cylinder on my old SVX.
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1994 SVX L - FWD Barcelona Red 190K miles ~ SOLD 1994 SVX LS - 5spd AWD Emerald Green 202k miles PWR Radiator, HID 5000k, New paint job with issues, 17" STI BBS wheels, converted to 5spd AWD from FWD. Purchased from SVXyGirl 2/20/09 -- Undergoing complete rebuild 1993 Justy 4wd 5door- Teal of sorts , beater. 2008 OBXT Newport Pearl 65k miles |
#7
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Re: running on 4-5 cylinders
Quote:
There is one on the right rear corner of the inlet manifold, and the one from the rear of the block to the firewall. And of course the body ground in front of the battery. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#8
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Re: running on 4-5 cylinders
well i just got home from work and tried starting the car with the MAF unplugged like icing said and it ran for a few seconds then died out. i started it with it plugged in and it ran then died when i unplugged it so i guess i can rule out the maf being the issue. ill try checking the coils and fuel injectors tomorrow morning before i go to work
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#9
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Re: running on 4-5 cylinders
Quote:
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#10
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Re: running on 4-5 cylinders
i had it unplugged all night the other day but it didnt make any difference when i reconnected the battery still had the same codes
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#11
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Re: running on 4-5 cylinders
it's probably not that it still has the codes stored but that they reset as soon as you turned it on. this is a good thing for finding out what is wrong because hard faults are much easier to find.
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