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Need Help: " Very Big BACKFIRE "
Hello,
I'm having a " Very Big BACKFIRE " on my 1987 Turbo and I don't know is it safe or I need to do some thing with it ? Even other Car drivers are scared on the street. I have in my car the following moods :- K27 Turbo, Tial 1 bar, Fabspeed " IC, headers, Muffler, Air intake" I never change any sittings on my car computer Please advice what I have to do ? Thanks, Fahad Last edited by Falnaim; 12-13-2012 at 02:44 PM.. |
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12-13-2012, 02:20 PM
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What in the heck are you talking about?
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1981 911SC ROW SOLD - JULY 2015 Pacific Blue Wayne |
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12-13-2012, 02:36 PM
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Quote:
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'80SC Widebody 3.6 transplant Anthracite "The Rocket" Long gone but still miss them all: '77 911 Targa, '72 BMW 3.0CS Coupe(finest car I ever had!) '71 911T Coupe White, '70 911T Coupe Blue '68 911 Coupe Orange, '68 911L Soft Window Targa |
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12-13-2012, 02:39 PM
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Yes, sorry for the typo
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12-13-2012, 02:42 PM
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Well, that makes a bit more sense.
Sounds like you need to adjust the fuel/air mixture. The turbo forum woul be a better place for this although those guys seem to dig flames coming out of their exhaust. 
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1981 911SC ROW SOLD - JULY 2015 Pacific Blue Wayne |
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12-13-2012, 02:46 PM
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 . To the OP, make sure all of your exhaust gaskets and nuts are good and tight since you've made some "moods" there .ps: Just pickin' with ya Falnaim... you probably couldn't understand my accent if I was speaking to ya...good luck! |
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12-13-2012, 02:47 PM
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Is that the only issue? does it take the throttle okay? Backfires when? Hot, Cold? More detail.
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Rusty 71 911E 55 PreA speedster 85 Turbo look Cab 62 Twin Grille Roadster (getting close) |
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12-14-2012, 01:10 AM
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Actually I have when I let of the gas smal backfire and I just figger out that when RPM reach around 4000 my engen start to jerk and give the big backfire !!!
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12-14-2012, 01:42 AM
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You're AFR is gone off whack for some reason, your car doesn't have a computer since in 87 they still used CIS injection
Could be a bunch of things, your post doesn't detail enough for us to really trouble shoot your problem. I would think if this is a recent development that your fuel pump might be on its way out
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12-14-2012, 03:36 AM
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Don Ivey '87 Carrera '13 Scion FR-S My Porsche tinks, therefore I am. |
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12-14-2012, 06:03 AM
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" post earlier (since deleted), as I was thinking exactly the same thing...I was wrong too
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12-14-2012, 06:23 AM
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the turbo has a relay that goes open loop at, i thought around 3k rpm. this takes the O2 sensor out of the equation and it just uses fuel pressure (and the AFM) to se t the mixture.
i saw you had a bigger spring, you may have to richen it up for this "turbo killer" 1 bar spring. i would start with the WUR and vauum circuit to it. (vacuum enrichment for the WUR). there may be an enrichment kit out there. i was looking at a 930 that hadd the 1 bar spring and an enrichment kit from andial. i passed.
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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12-14-2012, 07:24 AM
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OK, This Thing start happening after installing my New K27 Turbo 4 days ago.
Please not that all the following items was installed new 3 months ago and my car was running perfectly:- Tial 1 Bar WG Boost Pressure Switch Relay for Air Flow Sensor Boost Pressure New Fuel Pumps front & back Distributor Cape Ignition cables Coil Wire My Car is over boosting after the new Turbo installation and I think this is what cosign this problem. what do you think to do ??? Thanks, |
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12-14-2012, 07:26 AM
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12-14-2012, 07:59 AM
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Champagne on Beer Budget
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Sounds like wastegate to me...First time mine opened up, I looked in my mirror on the road behind me for parts falling out of the engine!
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12-14-2012, 08:13 AM
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12-14-2012, 02:35 PM
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Ok with a bit more info its def starting to sound like an overboost issue, do you have a manual boost controller? If so I would dial back the boost to 7-9 pounds (PSI) and see how the motor responds I overboosted my NG900 one time at 24psi, and it was similar to this, lucky to not blow the motor... although it acted the same way when my pump was on the way out If you don't have a manual boost controller, than replace the WG spring
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____________________ 1985 Carrera: Big Reds = Ass Saver |
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12-14-2012, 09:13 PM
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1985 Porsche 911 Carrera
1985 Porsche 911 Carrera
1987 Porsche 911 Turbo
