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07-07-2008, 08:29 AM
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#131 (permalink) | |
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Dru
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Re: do these cars ever idle correctly?
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have you done anything with the throttle body? I think it's something to do with the TB because the TB would have a lot to do with allowing the car to warm up (adjusting air/vuel....choking basically)....if it's not doing that right, it would explain why the car runs like crap at first.... what have you tried thus far to check it? i always thought it was because my IAC was bad, but i replaced that and it still does it...it's just really annoying when i'm cruising through traffic...if you hold on your throttle around 2-3 grand, does it pop and miss? try it...just put it in neutral and barely lay on the gas...mine misses, and this is what causes the car to wiggle and jerk about...but if I nail the throttle, all is well..i don't get it... |
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07-07-2008, 12:34 PM
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#132 (permalink) |
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Rock Chalk, Jayhawk
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Re: do these cars ever idle correctly?
I'll give that a try in neutral.
So far, I've replaced plugs and coil packs, injectors, and I've pressure tested. The other thing I can see making a difference warm or cold is that the car goes to open loop mode when it warms up. Maybe you're onto something with the throttle body. I just can't think of much that would cause a miss at low load and be fine at higher loads.
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 AIR: WRX 13T turbos, Greddy FMIC, K&N Filter, A'pexi twin chamber BOV, Greddy Profec B, ESP downpipe, IPS single shot catback FUEL: Greddy E-Manage,Walbro 255lph pump, IPO hotwire kit, AEM AFPR, 450cc injectors SPARK: MSD wires, NGK plugs DRIVETRAIN: PST 2-piece CFDS, Centerforce dual friction clutch |
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07-07-2008, 12:38 PM
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#133 (permalink) | |
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Forum Member
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Re: do these cars ever idle correctly?
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'91 VR4 - Modlist: DR650R turbos, Snow stage 2D alky kit, DSM SMICs, blowthrough ported LT1 MAS, Dejon Tool intakes & y-pipe, Blitz DSBC Spec R, HKS SSQV BOV, PTE 580cc injectors, Dual feed fuel system with Aeromotive FPR & filter, Hotwired Supra pump, HKS DLI, MSD Wires, Apex'i S-AFC II, MAFTranslator, Turbobob ECU, Scanmaster III, LC-1 WBO2, ESP downpipe, Vac/EGR delete, Gutted precats and test pipe, Maximal solid mounts, 300m 18 spline output shaft, Centerforce Dual Friction clutch, RPS flywheel, GC coilover conversions with helper springs, Powerslot slotted rotors, Goodridge SS brake lines, Hawk pads (front), Stillen metal matrix pads (rear)
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07-07-2008, 05:06 PM
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#134 (permalink) | |
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Dru
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Re: do these cars ever idle correctly?
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and yeah...i don't get it either..hah... however, once I get home from work, i'm going to read that long thread that was just posted...that sounds interesting... |
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07-07-2008, 06:15 PM
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#135 (permalink) | |
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Also known as MacGyver
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Re: do these cars ever idle correctly?
94 N/A
My car does this exact thing: runs fine, except hesitates and jerks under low acceleration. Here's what happens: I go about 30mph, shift into 4th, and try to accelerate. Just cruising is not a problem, but once I put some gas into it, it starts hesitating. Also does it when starting in 1st from a stop. No problems at WOT. I checked my ISC today. One of the coils is bad so I loosened the BISS a bit to keep an idle around 1000RPM. ECU looks OK (It's a 94) but I'm replacing the capacitors anyway. For anyone needing a new ISC/IAC: Get one for $72 here new: RockAuto Parts Catalog Part Number AC99
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07-07-2008, 07:08 PM
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#136 (permalink) | |
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Dru
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Re: do these cars ever idle correctly?
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i read through this a little bit..it doesn't sound like the exact same problem I am having... i've recently replaced my ISC and ECU caps....still misses. I even tried unplugging the ECS computer to see if it was messing with my main ECM...didn't change anything.... |
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07-07-2008, 08:44 PM
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#137 (permalink) |
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Dru
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Re: do these cars ever idle correctly?
i just went outside to see if my misfiring problem was in between any certain idle speed, and it's not....it's only when i'm light on the throttle...however, I did notice that it does miss a little during high idle...it's kind of chilly out..so the high idle was approaching 2k when I started it...it was missing a little then too...it's just a little gurgling/bubbling sound coming from the exhaust at idle, but still noticeable...but yeah, i tried 1500, 2500, 3500...it misses....
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