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Idles rough runs great at idle no. 1 and 4 fuel inj. make no difference when unpluged

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Posted on Apr 25, 2015

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Why does my 89 pontiac 6000le idle slightly rough after having the fuel injectors replaced? The reason I had to have them replaced was because of the ethanol in todays fuel ruined the original fuel in


If it is idling like it was before the inj were replaced then you have fixed the wrong problem the ethonol doesn't damage injectors you probably have a spark plug wire that is bad or a coilpack is bad or you have a fouled spark plug? A compression test can tell you of any problems with the valves! The injectors are designed to be compatible with flamible liquids ie gasoline or alcohol! I have been a mechanic for 23 years and have never seen inj fail due to alcohol in today's gasolines! You might have been scammed? Anytime you have repairs done request your old parts to be returned to you! You might have to take the mechanic who claimed he replaced your inj to small claims court! Try replacing the plug wires and the spark plugs first if no change then get carburetor cleaner and with the engine running spray the inside of the throttle body where it is black with the throttle open and engine rpms increased if that doesn't change it the coil packs might be going bad there are three so buy all three as a set so you don't have to change them at different intervals! Depending on mileage the timing belt is reccommended to be changed at 150,000 miles the spark plugs are due at 100,000 the coil packs should last over 200,000 miles so I'm guessing it is time for major preventative maintenance? The timing belt being worn can cause rough idle too!

Jan 16, 2015 | Pontiac Cars & Trucks

1 Answer

I have a 97 dodge caravan 2.4L dohc. I started with an engine code of p0303 and p0304. The vehicle has a rough idle and has difficulty accelerating from idle to 35mph. I've run several tests; 1, pulled all...


DTC P0303: Cylinder 3 Misfire Detected
Probable cause:
  1. Control unit software needs updating
  2. PCM or ECM faulty
  3. Fuel injector(s) faulty
  4. Ignition system - Ignition module, coil, spark plugs and wires
  5. Fuel system

Mar 13, 2017 | 1997 Dodge Caravan

1 Answer

I have a 2003 corolla 4zz-fe with an extreme rough idling problem , any ideas what it might be?


problem lies in mass air flow . you can try to clean it first with fuel inj cleaner . if that didnt work replace it with a new one

Jan 28, 2013 | 2004 Toyota Corolla

1 Answer

Has low power, surges @ cruizing speed, rough idle (code 32)


You can remove the egr and see if it has been sealing,and if it still moves.

Jan 29, 2010 | 1993 GMC Sonoma Club

2 Answers

86 Ranger 4X4 2.9 fuel inj runs rough when warmed up


1988 ranger 2.9 runs great cold then after a few minutes when warmed up hesitates with intermittent black smoke from the tail pipe until i hit the the throttle then clears and will repeat this behavior...

Jan 26, 2010 | 1986 Ford Ranger 2WD

1 Answer

Ticking noise coming from engine, loss of power, runs very rough!


check inj thay do click but not very load but becuase it might be it damaged it is doing this

Aug 10, 2009 | 1996 GMC Jimmy

4 Answers

Runs extremly rough at idle runs great at speed


IDLE POSITION CENSOR IT IS ON THE OUTSIDE ONTHE SIDE OF YOUR TBI DISCONNECT THE WIRING IF THE IDLE SMOOTHS OUT IT IS YOUR PROBLEM IF YOU LEAVE IT UNPLUGED IT WILL RUN FINE BUT YOU WILL HAVE A CHECK ENGINE LIGHT

Jun 24, 2009 | 1994 GMC Sierra

1 Answer

P0301 - Cylinder 1 Misfire Detected on a 1998 s-10 idles rough


Sounds like a bad fuel injector. Shop would need to run a contribution test to confirm. I must say, good detective work, good luck.

Apr 10, 2009 | 2004 Jeep Wrangler

1 Answer

ROUGH IDLE AND HIGH FUEL CONSUMPTION - HESITATION


Try checking your Spark plugs (they MUST be the right type, clean, and properly adjusted: and try adjusting your timing. Either or both of these could cause this type of problem Hope it helps. If so, don't forget to rate the answer, will you?

Dec 13, 2008 | 1988 Mazda B2200

1 Answer

Injector problem 4 litre eng.


hook up to computer (snapon,otc,ect.)need more data to diagonois properly don,t think needed injectors at all head gaskets, map sensor commen on this vech.6184512886 bigjim.

Nov 30, 2008 | 1995 Oldsmobile Aurora

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