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Old 10-02-2006, 01:24 PM
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Good job every one!

found this on iATN:

Rating:
Status: Closed w/Fix
Comments: No Comments
Replies: 8 (View Replies)
From: James N. Ellison
Date: Apr 22, 2004 9:08 AM

REPLY: Click here to reply to this FIX!

1992 Subaru SVX

Engine: 3.3 L / 202 CID / 6 cyl / Gas / DOHC
Fuel: Fuel Injection / SEFI
Ignition: Distributorless
Trans: 4-speed Automatic Transaxle (Electronic)
Mileage: 120,000 mi
Emissions: FED EMISSIONS
VIN: JF1CX3536N

Symptoms: Surge
Occurs: Under load, On Accel
More Info: Test results included below

_____________________ ORIGINAL MESSAGE _____________________

This Subaru is kicking my butt. There are no codes stored.
What happens is the vehicle surges when taking off from a stop
at a very light throttle. When brake torquing engine in stall,
surge will occur at about 1800 rpms at a steady throttle. O2
activity increase when this occurs but switches ok. Adding
propane does not affect surging at all. Unpluggung Maf only
made condition worse. Has anyone come across something like
this? I have run out of ideas on where to go from here. Any
info would be greatly appreciated, thanks

Ken

___________________ TEST AND REPAIR DATA ___________________

TESTING AND RESULTS

Tps - sweep tested good Maf - tested good O2's - tested good

__________________________ UPDATE __________________________

I have unplugged the egr and vehicle still does it. Fuel
pressure is at 30 psi @ idle and 35psi under load. This thing
is weird though. It does not feel like a misfire at all it
almost feels like a car that hits the rev limiter- but this
car is cutting out spark or fuel. Under brake torque engine
feels like it is going up and down maybe about 200 rpm and
pretty rapidly. You can see this in a vacuum gauge. It
flucuates rapidly between 8 & 9 inches of vacuum. I am
considering checking the timing belt but not sure how involved
of a job that is. Any pointers on checking these timing marks,
is it fairly easy?

____________________________ FIX ___________________________

Sorry about the delay in posting this fix. I wanted to wait a
couple of days to make sure that there were no further
problems with this vehicle. I would like to thank everyone
that took the time to offer me some ideas on this vehicle. I
ended up checking fuel pressure (ok), cleaned fuel injectors
(no help), retested egr operation (no problem found), and
lastly i took the timing covers off to check belt timing (belt
timing was right on the money (go figure). I was about to give
up on this car until i stumbled across a website
(subaru-svx.net). There was a technical question area on this
website that i read though. I stumbled across a post that had
a very similar complaint as mine. There was no posted fix on
this vehicle but i did noticed that someone had suggested to
take the ecm out and to break the black insulation around a
noise suppressor inside the ecm. He commented that this was
very common on these vehicles that when the mileage started
reaching 120,000 miles that they start developing these
hesistation/stumble complaints on acceleration. To make a long
story short, because i was out of ideas on things to check i
decided to give this a try. After doing this procedure the
vehicle appears to be fixed, i drove it several times and have
not gotten it to act up for me. The customer has had it for
almost a week and i haven't heard back from her . Kind of a
weird fix, but what the heck- i'll take it! Again, thank you
all for the help you have given to me on this problem child.

Ken


James N. Ellison
Owner/Technician
Ellison Auto Clinic, Inc.
Wauconda, Illinois, USA
__________________
- John
ASE certified Master Tech W/ X1
Twin City Fleet repair, St. Paul, MN
need work done? Have tools will travel
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  #2  
Old 10-02-2006, 05:45 PM
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immortal_suby immortal_suby is offline
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thats pretty cool!
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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
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