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#1
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Slight engine missing when the head lights are on!
This is a new one for this car. While I'm sitting at a red light, if I turn on the side marker lamps or headlamps,, the engine starts to miss. Not bad enough to stall the engine by any means, but you can feel and hear the hiccups. Turn the lights off, everything is silky smooth.
Obviously, a possible short somewhere but has anyone experience this before? If I recall correctly, this is similar to the crankshaft position sensor doing something similar. The shielding on this wire is exposed so perhaps an EMI is being created? Just a shot in the dark!
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If it ain't broken it, doesn't have enough features!!! '92 SVX LSL '03 4Runner '96 FZJ80 Landcruiser '90 Mercedes 300E |
#2
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Re: Slight engine missing when the head lights are on!
Don't overlook the possibility that you battery or your alternator is weak. Free 'load' tests can be attained at most auto parts store (i.e. Autozone, Advance Auto, etc.)
You may also want to double check that the TPS is properly adjusted. I know when I turn my lights on, typically when cold, RPMs fluctuate quite a bit sometimes. Just my $.02
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- Sonny [1992 LSl, Claret 160k] / [1992 LSl, Dark Teal #378 172k] / [1992 LSl, Claret 150k] / [1992 LSl, Liquid Silver donor] / [1992 LSl, Liquid Silver 4.44] / [1997 LSi, Polo green #089, 150k] 1992 Chevrolet Lumina Z34, white 35k miles 1992 Chevrolet Lumina Euro, charcoal grey >200k (first car) 1992 Chevrolet Lumina Euro, charcoal grey >200K (for sale) 1986 Honda VF500F Interceptor 1994 GMC Jimmy S-15 |
#3
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Re: Slight engine missing when the head lights are on!
A dying alternator will produce all sorts of weird symptoms in our cars. Mine was misfiring, making thumping noises from the stereo, and could barely drive forward. Definitely take a look and see what sort of voltage it's outputting under load.
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Chris 92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping 2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos 2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold 2020 Ram 1500 Longhorn - Red Pearl |
#4
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Re: Slight engine missing when the head lights are on!
Check your grounds also. Battery -> chassis and chassis-> engine. The chassis ground is on the horn bracket in front of the battery. The engine ground is on the engine block somewhere near the starter.
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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 |
#5
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Re: Slight engine missing when the head lights are on!
Quote:
The intermittent issue has gone worse by the end of the day. Now, she misses while idling with or w/o an electrical load turned on. I even felt couple of hicckups while accelerating as well. Looks like the miss is being caused by spark escaping out of the spark plug coil, cyl #1, #2 or #3 is the culprit. I can hear a spark jump and see the engine miss. I bet one of my spark plug coil housing is probably cracked and causing the spark to ground out. Will check the ground today, thanks for the suggestion.
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If it ain't broken it, doesn't have enough features!!! '92 SVX LSL '03 4Runner '96 FZJ80 Landcruiser '90 Mercedes 300E Last edited by alia176; 04-24-2012 at 08:18 AM. |
#6
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Re: Slight engine missing when the head lights are on!
Quote:
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. |
#7
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*** update **
Well, it turned out that #2 ignition coil (middle, passenger side U.S.) was the culprit. Swapped it out with a brand new unit and all is well.
I'll replace all plug coils eventually as they have around 150k miles on them.
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If it ain't broken it, doesn't have enough features!!! '92 SVX LSL '03 4Runner '96 FZJ80 Landcruiser '90 Mercedes 300E |
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