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#1
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Rough engine, bumpy idle, poor gas milage and no pep
Hi folks.
Just recently, the old svx has started acting up all of a sudden. At idle and RPMs below about 2500, the engine shakes and runs really rough. If I'm on the highway and hit the gas, the whole car vibrates. When I let my foot of the gas, it smoothes out. On my 40 some odd mile trip to work this morning, it emptied about a 3rd of its tank of gas. Taking off from a stop, there's no pep what so ever. My first thought was that it's mis-firing, but I filled it up at a gas station I don't usually go to, so I'm wondering if it could be a bad tank of gas. I've had bad petrol before, but it's never caused problems as severe as this. Does this sound like a familiar problem to anyone?
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Out for good. |
#2
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It could very well be a really bad tank of gas. It also sounds like a bad O2 sensor. Do you have a check engine light on? It could also be some sort of intake leak. My mom's Legacy had similar symptoms from a worn intake gasket.
Dave P.S. Your signature is wrong. If you are going to use Victor for V and X-Ray for X, then S should be Sierra |
#3
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Thanks for the reply. I have no error lights nor does the power light blink during startup.
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Out for good. |
#4
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My friends car had similiar symptoms when he had a bad MAF.
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1995 Subaru SVX -Accel Green Filter * -Flowmaster Exhaust -ECU Stage 1 Chip * -Alluminum Drive Pulley * -Stage 1 Shift Kit -Small Car Clear Lenses and Corners -1997 SVX Grill -17" X 7" Enkei Shoguns *Thanks Dayle! (SVX Motorsports) 1987 Pontiac Formula 350 -Enough (Once I put it back together again) |
#5
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it sounds like a misfiring coil to me. it could also be bad gas, a bad maf or maybe your timing belt skipped a few teeth. just somethings to check. good luck
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#6
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Sounds like a bad MAF to me too.
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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. |
#7
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Let us not forget simple things either. Maybe, you're looking at poor spark plugs, dirty air filter, dirty oil, worn fuel pump and/or filter. You might also want to check your idler pully; that could cause rough idle .
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#8
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I'd be more inclined to look for things that would affect all cylinders rather than a spark plug, a coil, etc. Individual cylinder failure wouldn't cause near the problem you're describing. A bad MAF or a hose falling off between the MAF and t-body are likely candidates.
A bad air filter, dirty oil? Come on. I know the idler pulley was a joke but actually it holds more plausibility than the air filter and the oil.
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
#9
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Have you tried pulling codes from the ECU?
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#10
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Quote:
I threw dirty oil in b/c if the oil is nasty; the crankshaft could not move correctly and this could cause shuddering. (Mind you, we're talking oil that is years old; not months) I may be a bit on the younger side. However, I find that a lot of car problems are caused by simple things; not by problems that require $400 worth of work.
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi Last edited by Manarius; 07-19-2005 at 04:49 AM. |
#11
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Quote:
Dirty oil? Dirty air filter? Old spark plugs? Come on. I see dirty filters and rotten spark plugs all day long. They don't cause problems like this. They cause excess fuel consumption and higher emissions, maybe a rough idle but not rough shaking at highway speeds.The sudden onset also points to faulty sensor or an intake leak of some sort....something that can happen suddenly and instantly cause problems. Dirty filters and plugs gradually decrease performance. And I've never heard of dirty oil causing crankshaft "shuddering" Dave (running to add crankshaft anti-shudder additive to my oil) |
#12
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Quote:
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#13
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I might be a bit on the older side, and still make mistakes.
Becides all the things that Manarius suggested, I would check the ground wire at the back of the engine, below the throttle bodies, it runs to the firewall below the ignitors. The MAF meter could be suspect, along with the air pipe between the MAF and throttle bodies.
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. |
#14
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plugs or coils my problem was similar 6 months ago.
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#15
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i'm still aiming towards coil.
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