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Sputtering and jerky idle (relisted) pls read
Hi, i thought to start that topic again as that post went too far with no result and not great amount of information. I believe many ppl have the problem.
So why dont we, who have the problem, describe it and write the actions u have done and what have changed or if u fixed problem, share the secret. OK i start: It started to happen after i changed the spark plugs Symptoms: when its cold, its sweet as, then after 2-3 minutes of driving or 3-7 mins of idle it startes to miss with some kinda clicking. Like it can work fine for few seconds then it misses, engine shakes, then fine again. Also after driving, and stayin on the lights, it can just idle bad as with RPMs dropping to 400 and then back to 1000 and going like that and shaking the car. Plus my acceleration sometimes was in wave pattern: same throttle opening but car accelerates faster/slower. I ve checked the sensors for bad contacts - did not help. Changed the vacuum hoses (which were just terrible and its good ive changed them) but still no luck. Then i ve read that bad PCV could be the problem, and changed PCV with a hose going from it. Still no luck. Oh yes, i definitly tried injector cleaners... and no luck at all. Then i thought it can be fuel pump or pressure regulator, but i have experienced problem for 5 months and fuel pump dies in few days. Then pressure regulator... i disconnected that vacuum line to it, which turned regulator off, letting the maximum pressure.. but problem was there... so that excluded the pressure regulator and pump... also O2 sensor and MAF sensor could be the suspects, but someone changed them with no luck so i could not be bothered... also i did disconnect the MAF and drove without it and car acted the same... and today... i did the thing i ve done the first when i started to chase the problem... but beeing patient.... unpluging the injectors 1 by 1, and 1 at the time and waiting for a minute or so... which gave me that only 1 injector (cyllinder) give me stable 5 cyllinder opertaion and rest 5 give me unstable (rough) 5 cyllinder idle... so now i ve narrowed my search to: 1) injector 2) injector controlling electronic system 3) Spark plug 4) Coil then again, spark plug was new and it was proper NGK platinum one, so i doubt it can be bad. The injector has "1" written on it, its second on the left if u look on the engine from upfront (passenger side in USA) there are 2 injectors with "1", 2 with "2", 1 with "3", 1 with "4" ok and now i need ur help guys... again : is my logic correct and im left with 1) 2) and 4) and how can i narrow my search here and repair it? pls take into consideration that i would preffer to spend as less money as i can... i.e anyone got description/pictures how injectors work and controlled? and if i can check the coil (i think its my last guess out those 3 as car works fine when its cold...) p.s. hope this can help to the rest of u strugling... but still pls write ur symptoms and what u have done.. it actually can help the rest.(at least dont spend time and money changing everything ) |
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92 ls-l w/ 135k
Symptoms Only on cold start Car starts and idles fine After driven for approx 1 mile and then idled car runs rough Feels like it's missing on a cylinder After a minute or so of rough idle/ rough driving problem disappears and does not come back This problem appeared randomly - no work had been done on the car when it started pulling this. tried: -shutting off car and restart when symptoms come up - didn't work -swapped MAF with known good MAF - did not help -injector cleaners - no help -car got new plugs at dealer at 100k (I hope they were platinum - P.O. had done) -If car is left to idle in driveway up to operating temp before driving it the problem does not come up.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#3
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Re: Sputtering and jerky idle (relisted) pls read
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The others will take a little work and it's colder than hell out. If it warms up today I'll see if I can narrow it down to 1 cylinder. Since you know which cylinder you have bad you can switch injectors between 2 and see if the problem moves.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#4
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2) how can i swap em? (is it as simple as unscrewing those couple of bolts?) 3)does having 2 injectors with "1" on them, mean that they are the same and i can replug them (swap wires and connectors going to them) (to see if it controlling system..) hey dont bother swapping ecus if i can swap injectors and then connectors i ll narrow the search definitly to something particular... cheers hope this method can help u too... but ur problem seems to be more weird then mine!! |
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The fuel injectors are interchangeable.
I dont think you can swap the wires though - they'd be out of phase - that would be bad. Relieve the fuel pressure by unplugging the fuel pump under the rear seat and running it out or by clamping off the fuel line Take off the cap over the fuel injector (2 phillips screws) and unplug it First try pulling the injector out while turning it to the 90 degree mark. You might be lucky and it will slide out easily. If not - twist the fuel injector 90 degrees so the angled part is over the fuel rail use a large flat bladed screwdriver to pry up on the red plastic part of the injector to remove the injector. Be very careful not to break anything. The injector should come up pretty easily - try not to gouge the red plastic. There is a how to on this somewhere, Im trying to find it now.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#6
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ok ill try that
also will try to c what i got in my online manuals.. |
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Speaking of ignition electronics, can anyone confirm if this piece has ever been a problem on anyone's SVX:
http://dcss.dyn.dhs.org/pics/whatsitdo.jpg
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#8
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Ignitor!
no.
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Jim 1995 Laguna Blue SVX AWD L - 240K (daily driver) - "ReBuILT" used engine at 236K miles (6/13) 2013 Veloster Red - Driver Now??Dropsprings [1/2" rear, 1" front] with Koni Strut Inserts> Magnaflow Exhaust System> ECUTune Stage 1av1 Upgrade (from 1v4)> ECUTune TCU MOD> Aluminum Crankshaft Pulley> Stainless Brake Lines> Phenolic Spacers> Perforated Brake Rotors (dint like, OEM now)> SmallCar Shift Kit (resting since TCU MOD)> 7-Position Ground System> High-Pressure Fuel Pressure Regulator (resting)> ATF Cooler & Campaign Filter> Yellow Polish Polyurethane Bushings> Pioneer Double-DIN Stereo with JL AUDIO Speakers> Driveshaft Rebuilt with C-Clip U-Joints> 15 Min MOD> 20 Min MOD .. . (2011) Valentine One Radar Detector with Remote Display - ucan'tseeme! |
#9
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w.t.f is it man?
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#10
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Sputtering and jerky idle
6EVIL9
I have the same problem. It usually occurs when I really stomp on it before the engine warms up (like pulling out in traffic), and then at the next stop it really runs rough. If I let the engine warm up, it doesn't happen. If I don't let it warm up, but drive gently until it does, it doesn't happen. Sooo, I've concluded that one of the ignition coil packs (there's one on each plug) is breaking down when the engine is cold. When I stomp on the accelerator a bunch of fuel is dumped in that cylinder, and with no spark, the engine runs verrrry rough. At least thats my theory. I've learned to adjust my driving habits until I get around to exploring it more... cayent 92 SVX 01 VDC |
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What timing! I was looking for a solution to a similar problem and found this site. Unfortunately, I have no solution but more data...
My wife's 1994 SVX LE, 49k miles Almost same symptoms as immortal_suby, namely: Only on cold start Car starts and idles fine After driven for approx 1 mile and then idled car runs rough [in my case, also stalls] Feels like it's missing on a cylinder After a minute or so of rough idle/ rough driving problem disappears and does not come back Differences: I drove the car today, and noted the following. If you slow down or stop wile running roughly, car stalls, and dash lights come on. Can restart right away. Also, when running roughly, I gave it a little more gas to try to keep it running, and the POWER light came on. Strange. I had never seen it. I couldn't make it come on again even by flooring the accelerator. Tried: Dealer reported no error codes found, but replaced L/R O2 sensors ($400). Wife reports problem is worse, if anything. Dealer called Subaru, which suggests new plugs, fuel-injector cleaning, and "upper engine cleaning(?)" but no guarantee it will help. Research on this and other sites suggests that replacing PCV valve may help? Looking for suggestions... musichem 94 SVX 00 Outback |
#12
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Quote:
i was told that it was vapor lock?? what do you guys think? |
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#14
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In the interest of keeping this disscussion going, I have researched the two threads and summarized everything that I can find that has been tried. What 's left? Any new ideas? I'll update if ours gets any better...
Things tried that did not work or made it worse: Changed spark plugs (6evil9) Replace L/R O2 sensors (musichem) Fuel filter (mine was replaced recently, James Scott, pylon500) cleaning the throttle body and AIC (what's this?) (James Scott) Temperature sensor (James Scott) Voltage/Continuity Checks (James Scott) replaced coil pack wire and injector on one cylinder (James Scott) Cleaned TPS (James Scott, 6evil9) MAF/O2/Sparks (92Blacknessvx) Cleaned throttle body and injector cleaner (6evil9) TECHRON Fuel System Cleaner (James Scott) PCV Valve changed (6evil9) MAF (immortal_suby) check ECU under dash (6evil9) Suggestions: Bad fuel (Immortal_suby) Went away by itself (Motorsort-SVX) Add "dry-gas" , MAF(MoodyBlue) Check/replace all vacuum hoses (6evil9) turn screw to open idle opening of throttle butterflies (6evil9) Restore 6 cyl. engine oil treatment, then Fuel System cleaner (nextcubepro) injector/electronics (6evil9) sparks/coil (6evil9) allow to warm up at idle (immortal_suby) bad ignition coil pack (Cayent) |
#15
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sorry for beeing out for a while...
ok what i think is that even if u have similar symptoms we mite have different problems Matt have u tried to see if its ur cyllinder misfiring or whole petrol system is bad? (same as i did) which i advise to everyone. as: if u find out that it s ur cyllinder misfiring then changing MAF, O2, TPS, temp sensor and all that is just waste of money otherwise if its the whole system and not one of cyllinders, then changing coil packs and sparks, fuel injectors is waste of time and money. so save both and spend 10 minutes for that. Quote:
but not sure if u r talking about PCV system.... but if ur dipstic pops up and o-ring is good, then check the hoses replace them and maybe replace PCV... cheap, but pain in ur hands... Quote:
hmm dont forget that check engine should ve tell u bout that, and if it did not then o2 sensor is not a problem... seems like ur dealer just wanted ur money... anyways check for possible codes that "check engine" gives u... and illuminate them Quote:
anyways if u want more help pm me.. c u for now Last edited by 6evil9; 12-23-2003 at 04:58 AM. |
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