10-30-2023, 02:20 AM
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#1
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Junior Member
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Join Date: Nov 2018
Location: Bellingham WA
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Junior Member
Join Date: Nov 2018
Location: Bellingham WA
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Ran out of gas, now '96 4Runner runs wonky
I've searched thru other threads but can't seem to find this particular situation, so am hoping you guys can help - I ran my '96 'Runner out of gas last week, and managed to limp back to a gas station which was luckily downhill. In the process there were a half dozen sneezes/backfires thru the intake. I put about a half tank of fuel in, but now the old girl runs like crap. The CEL is on, and she threw a couple codes (P-0101 and -0102 I think), both of which were MAF related, so I pulled the MAF and it was pretty oily, so gave it a good wash with rubbing alcohol and the carb cleaner for good measure, then reinstalled (no, I didn't touch the little filaments inside of the MAF venturi). Should also mention I have a K&N aftermarket air filter, which I cleaned as well. Also changed the inline fuel filter.
Yet it still runs just as badly - reluctant to start, then when I do get it running she will accelerate quasi-normally to 3000 and then it's like the fuel just cuts off - until the revs drop to 2000 then the power comes back up. At no point does it accelerate normally, have to do so gently or she just flat out bogs down.
I'm guessing that maybe the backfires thru the intake damaged something else, another sensor perhaps, but I have no idea which one, or if it's something else. Anyone else dealt with this problem??
1996 4Runner 4WD, 3.4l, MT, 400,000 miles (and ran like a top until this cluster-F).
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'96 Stellar Blue Pearl SR5, 3.4L, 5-spd MT, basically stock except for K&N perf. CAI, 16" FJ wheels and 231mm Tundra front brakes - 367,000 miles young and still rolling strong
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10-30-2023, 05:22 PM
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#2
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Senior Member
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Join Date: Mar 2010
Location: denver
Posts: 3,019
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Senior Member
Join Date: Mar 2010
Location: denver
Posts: 3,019
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Quote:
Originally Posted by northstr99
I've searched thru other threads but can't seem to find this particular situation, so am hoping you guys can help - I ran my '96 'Runner out of gas last week, and managed to limp back to a gas station which was luckily downhill. In the process there were a half dozen sneezes/backfires thru the intake. I put about a half tank of fuel in, but now the old girl runs like crap. The CEL is on, and she threw a couple codes (P-0101 and -0102 I think), both of which were MAF related, so I pulled the MAF and it was pretty oily, so gave it a good wash with rubbing alcohol and the carb cleaner for good measure, then reinstalled (no, I didn't touch the little filaments inside of the MAF venturi). Should also mention I have a K&N aftermarket air filter, which I cleaned as well. Also changed the inline fuel filter.
Yet it still runs just as badly - reluctant to start, then when I do get it running she will accelerate quasi-normally to 3000 and then it's like the fuel just cuts off - until the revs drop to 2000 then the power comes back up. At no point does it accelerate normally, have to do so gently or she just flat out bogs down.
I'm guessing that maybe the backfires thru the intake damaged something else, another sensor perhaps, but I have no idea which one, or if it's something else. Anyone else dealt with this problem??
1996 4Runner 4WD, 3.4l, MT, 400,000 miles (and ran like a top until this cluster-F).
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Check all'the fuses in the engine bay fuse box including the big ones. put a paper air filter in and get a new denso maf or clean old one with a maf cleaner. The k& N filters if not properly oiled and let dry will cause issues.
Last edited by spartacus; 10-30-2023 at 05:25 PM.
Reason: spelling
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10-30-2023, 06:06 PM
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#3
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Member
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Join Date: Jul 2012
Location: canada
Posts: 914
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Member
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Location: canada
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Look for disconnected hoses caused by the massive backfire, or search for a vaccuum leak, maybe a blown gasket along the intake route. A vaccuum leak can sometimes be heard or you can spray carb cleaner where you think it is and if the engine rpm changes you got your leak
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1998 4runner SR5
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10-30-2023, 06:58 PM
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#4
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Elite Member
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Join Date: Mar 2016
Location: Pasadena, CA
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Elite Member
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Location: Pasadena, CA
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Quote:
Originally Posted by diverscale
Look for disconnected hoses caused by the massive backfire, or search for a vaccuum leak, maybe a blown gasket along the intake route. A vaccuum leak can sometimes be heard or you can spray carb cleaner where you think it is and if the engine rpm changes you got your leak
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This is the direction I would go first, though both of the listed codes are MAF related...
-Charlie
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'99 4Runner SR5 Auto - 4WD swapped
'89 Camry Alltrac LE 3S-GTE 5spd
'17 Chevy Volt Premier
'16 Honda Odyssey Elite
Previous: '88 Camry Alltrac LE 3S-GE BEAMS, 90 Camry 3S-GTE, 90 Camry DX, '03 WRX wagon, '08 Outback XT
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10-31-2023, 03:59 PM
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#5
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Member
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Join Date: Jun 2021
Location: Eastern WA
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Member
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Ditch the oiled air filters, they cause more problems than they're worth. Put a paper one in.
When you clean the Maf, get Maf cleaner, don't use anything else on it. It's a sensitive and delicate thing, and the residue other cleaners have could screw it up.
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1998 4runner 2.7 manual
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11-01-2023, 10:22 AM
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#6
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Member
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Join Date: Oct 2023
Location: Colorado
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Member
Join Date: Oct 2023
Location: Colorado
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You could run some fuel system cleaner through as well, Seafoam or something similar.
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1998 SR5 - 5 speed w/ 4.30 E-locker
My 1998 SR5 Build Thread
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11-01-2023, 01:02 PM
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#7
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Junior Member
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Join Date: Nov 2018
Location: Bellingham WA
Posts: 10
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Junior Member
Join Date: Nov 2018
Location: Bellingham WA
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Thanks for the input everyone.
What would the fuses have to do with the symptoms? Seriously asking.
As for the debate about oiled vs. paper filters, it ran totally fine before the incident with said oiled filter, so that isn't the issue. And as for what MAF cleaner to use, that may be valid but there was zero effect after cleaning it, so doubtful the MAF is the issue anyway. It wasn't visibly gunked up before I cleaned it, just cleaned it anyway for good measure.
I will check again for vacuum leaks in the intake area, as there is possibility that could be causing problems. I checked once, but will make a closer inspection. I think it's telling that the main issue happens between very defined engine rpm ranges. Just don't know what story it's telling!
__________________
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'96 Stellar Blue Pearl SR5, 3.4L, 5-spd MT, basically stock except for K&N perf. CAI, 16" FJ wheels and 231mm Tundra front brakes - 367,000 miles young and still rolling strong
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11-02-2023, 09:00 AM
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#8
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Senior Member
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Join Date: Sep 2011
Location: Austin, Texas
Posts: 3,155
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Senior Member
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Quote:
Originally Posted by northstr99
... CEL is on, and she threw a couple codes (P-0101 and -0102 I think), both of which were MAF related, so I pulled the MAF and it was pretty oily, so gave it a good wash with rubbing alcohol and the carb cleaner for good measure.....
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I like to use MAF cleaner only on maf.
Do we all think alcohol and carb cleaner is a good substitute?
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.
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02-17-2024, 06:23 PM
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#9
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Junior Member
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Join Date: Nov 2018
Location: Bellingham WA
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Junior Member
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Closure
So figured I'd better close this loop. After all the head scratching I finally just ordered a salvaged low-miles MAF on fleabay, and it worked excellent, problem solved. Beware the scams on eBay tho, with cheap Chinese knock-off parts being sold in listings that have pictures of actual Nippon-Denso OEM parts. Make sure to do your homework.
Thanks again everyone.
__________________
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'96 Stellar Blue Pearl SR5, 3.4L, 5-spd MT, basically stock except for K&N perf. CAI, 16" FJ wheels and 231mm Tundra front brakes - 367,000 miles young and still rolling strong
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