HELP!!! pinging/knocking under light to medium load
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HELP!!! pinging/knocking under light to medium load
My (now my daughter's) '92 NA 4EAT wagon started pinging pretty badly on the trip from Tacoma to San Antonio this past week. I also had #1 injector failing (miss at idle, okay once up and running). I've replaced the injectors and it runs much better, but still rattles/pings under light to mediam load.
Could this be a failed knock sensor, or do I have something else going on?
On the good side, I got an average of over 31 MPG over 2300 miles running between 65 and 75 most of the way. Several legs were over 32 mpg, but I was running 300 miles either non-stop or with just one stop to use the bathroom.
Could this be a failed knock sensor, or do I have something else going on?
On the good side, I got an average of over 31 MPG over 2300 miles running between 65 and 75 most of the way. Several legs were over 32 mpg, but I was running 300 miles either non-stop or with just one stop to use the bathroom.
'90 Bermuda Blue L Wagon (Wife's),
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
Well,
I changed the knock sensor and that seems to have fixed it!!! Seems like it has a little less git up and go right off idle, but if it was overadvancing the timing that would make sense
I changed the knock sensor and that seems to have fixed it!!! Seems like it has a little less git up and go right off idle, but if it was overadvancing the timing that would make sense
'90 Bermuda Blue L Wagon (Wife's),
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
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yea those knock sensors go bad all the time. they are notorious for that crack.
-93 2.2T (RIP), 93 N/A best car on earth.
-00 legGT, 18" PIAA sport mesh wheels, front/rear Rallitek sways, lowered whitelines, coming soon: 2.5L sti internals, 20g heads P&P, twin charged. motor is almost ready to go in.
Andrew
-00 legGT, 18" PIAA sport mesh wheels, front/rear Rallitek sways, lowered whitelines, coming soon: 2.5L sti internals, 20g heads P&P, twin charged. motor is almost ready to go in.
Andrew
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Good that the symptom is fixed.
You might also check o2 sensor function and fuel pressure.
You might also check o2 sensor function and fuel pressure.
93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds. (Gone, but never forgotten)
johndrivesabox wrote: Rally, my kyboard is brok, his has nohing o do wih h liquor.
Originalcyn wrote:Apparently everyone hates Gabe.
Keep an eye on your coolant level and temp gauge as well. I had a '91 that would knock under load and it was a blown headgasket. Didn't figure it out until the car started heating up and I figured out the HG was literally overpressuring the coolant system and blowing the coolant out. Kicker was it would only do it under a load so the quick trip wouldn't cause any problems, it only happened when driving up hills.
84 GL Wagon - sold
84 DL Wagon - sold
92 L Wagon - sold
96 LS Wagon
93 SS daily driver
1946 BC-12D Taylorcraft restoration (airplane)
Me - retired engineer and pilot / flight instructor
84 DL Wagon - sold
92 L Wagon - sold
96 LS Wagon
93 SS daily driver
1946 BC-12D Taylorcraft restoration (airplane)
Me - retired engineer and pilot / flight instructor
Did you have a CEL on the knock sensor? If so, did you clear the ECU after replacing it?
Turbo Subies:
'87 GL-10 Turbo - SOLD
'90 BJ EJ22T/DOHC & 5speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX -SOLD
'96 BD-turbo'd-SOLD
'98 SF - NA-T
'87 GL-10 Turbo - SOLD
'90 BJ EJ22T/DOHC & 5speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX -SOLD
'96 BD-turbo'd-SOLD
'98 SF - NA-T
Okay to answer everything:
1. No coolant loss or overheat on a 2300 mile trip (Tacoma to San Antonio in 3 days) - Temp gauge never moved above normal even on the hard climbs in the passes
2. No CEL, that's one of the reasons I posted to get opinions
3. I'm back in Tacoma now, so hard to check fuel press or O2, but no CEL, and 32 MPG average for the trip...
4. Knock sensor WAS cracked and gapped open, and I had an injector starting to go, miss at idle, was getting worse at the end of the trip (replaced all 4 injectors with re-man's, idle is smooth again)
It was runninig good again when I left it, will stay in touch with my daughter and make sure it stays fixed...I thought about changing the O2 sensor, but it's running well, so I'll wait and see how it does. O2 is easy enough to replace, her granddad will be able to change it if needed.
Thanks for all the input.
1. No coolant loss or overheat on a 2300 mile trip (Tacoma to San Antonio in 3 days) - Temp gauge never moved above normal even on the hard climbs in the passes
2. No CEL, that's one of the reasons I posted to get opinions
3. I'm back in Tacoma now, so hard to check fuel press or O2, but no CEL, and 32 MPG average for the trip...
4. Knock sensor WAS cracked and gapped open, and I had an injector starting to go, miss at idle, was getting worse at the end of the trip (replaced all 4 injectors with re-man's, idle is smooth again)
It was runninig good again when I left it, will stay in touch with my daughter and make sure it stays fixed...I thought about changing the O2 sensor, but it's running well, so I'll wait and see how it does. O2 is easy enough to replace, her granddad will be able to change it if needed.
Thanks for all the input.
'90 Bermuda Blue L Wagon (Wife's),
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
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- Fifth Gear
- Posts: 2385
- Joined: Tue Mar 13, 2007 12:56 am
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32mpg makes me think it was running lean. Hopefully the injectors fixed it.
93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds. (Gone, but never forgotten)
johndrivesabox wrote: Rally, my kyboard is brok, his has nohing o do wih h liquor.
Originalcyn wrote:Apparently everyone hates Gabe.
Injectors did help, but it still rattled after changing them. used an Autozone knock sensor, didn't have time to order a Subie factory part. Had to get back to T-town for work.
I figure with the #1 injector starting to fail (or plug) that the ECU probably added fuel across the board to compensate based on the O2 sensor reading, but #1 would still have been lean.
I figure with the #1 injector starting to fail (or plug) that the ECU probably added fuel across the board to compensate based on the O2 sensor reading, but #1 would still have been lean.
'90 Bermuda Blue L Wagon (Wife's),
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
My AWD '90 w/4.10 gears gets 28-29 on long hiway runs with a couple of stops, so I didn't think 32 for a FWD 3.9 geared car was out of the question... I tracked each tank, and the worst was 28.8 after the gasstation monkey in Pendleton short filled me. Every other tank was between 31.8 and 33.1, tracked over 2300 miles.beatersubi wrote:32mpg makes me think it was running lean. Hopefully the injectors fixed it.
'90 Bermuda Blue L Wagon (Wife's),
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
-
- Fifth Gear
- Posts: 2385
- Joined: Tue Mar 13, 2007 12:56 am
- Location: 10-9-oh(!), wa
Missed the fwd part. Enticing fuel milage.
Any other luck tracking the source of the knock?
Any other luck tracking the source of the knock?
93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds. (Gone, but never forgotten)
johndrivesabox wrote: Rally, my kyboard is brok, his has nohing o do wih h liquor.
Originalcyn wrote:Apparently everyone hates Gabe.
Swapped the knock sensor (as above) and seems to have taken care of it. Talked to my Daughter this evening, and she got the inspection and tabs done, and is driving it to school and work. Said no rattle/knock and idling better than it was when I left, so the computer is re-learing all the new parts..
'90 Bermuda Blue L Wagon (Wife's),
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)
Auto, AWD, Now with 275K + miles!
2005 Outback, 2.5 AWD (wife's new daily)