new engine was fine now misfires badly ?
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This is a discussion on new engine was fine now misfires badly ? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; i just had an engine fitted into my 1996 wrx wagon , the engine came from a 1995 legacy twin ...

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    Unhappy new engine was fine now misfires badly ?

    i just had an engine fitted into my 1996 wrx wagon , the engine came from a 1995 legacy twin turbo . when i picked the car up after its mot it was driving fine for about 40 miles so i thought lets see what its got and i put the foot down for about 150 yards and then turned into my street, when i slowed down i tried to move off again down the hill in 2nd gear and the car just started to die on me it then started shudering and cut off all together.
    when it was back in the garage we took the drivers side coil pack off and turned the engine ,it was sparking and then it wasnt you could also see that when it was sparking the engine was trying to turn over obviously . sometimes the spark would be constant when the 2 coil packs were removed but when they were put back into the head its like they stopped sparking ?
    before the car would start just...and it used to make a slight popping noise every 10 seconds now it just doesnt start at all its like its only running on 1 cylinder ? or 2 ?
    the coil packs on the driver side are slightly cracked at the top and i have ordered a new set of 4 coil packs i am just wondering if its a bad cam sensor or if theres anything anyone can tell me about the problems im having , id be gratefull cheers !!
    PS: the engine was changed as there was a serious oil leak from within one off the barrels , suspected blown piston or sumfin loads of oil got in the exhaust system also .
    sorry bout the long post just thought it would help rather than wait for me 2 answer any little details

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    Registered User teflon_jones's Avatar
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    So what exactly did you do? Did you swap in the full twin turbo package from the other car? What is stock and what is not?
    Scott
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    Moderator Donkey's Avatar
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    Sounds like your from "across the pond".We here in the USA didn't get those models here so we are not as familer with their setups.I would definatly try a compression and leak dwon test on the cylinders and make sure the coil packs and injectors have the right plugs going to them so they are firing in the right order.Also check the spark plug gaps and the MAF sensor.
    Last edited by Donkey; 12-01-2008 at 07:09 AM.
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    compresion test shows that all is good and coil packs are in correct order as i said the car was perfect when i picked it up the engine was swaped and the same setup was kept apart from blocking of the oil hoses for the passenger side turbo other wise setup is the same ? not checked the maf sensor though .
    my mechanic also said that when he set up the new engine he had this problem with the missfire so he said he took out the coil packs gave the spark plugs a clean and put them back in and everything was fine ? i think this is why he thinks its the coil packs , me on the other hand , i believed at first it was the cam sensor located at the front of the engine above the pulley but who am i to question him

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    sorry forgot to mention , all my car has is as follows:
    hks blow off valve
    hks air filter
    hks exhaust (middle section and rear box)
    quickshift b&m
    silicone hoses
    everything else added is just big brake kits etc which i dont think would have any relevance to my problems.

  7. #6
    Moderator Donkey's Avatar
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    Quote Originally Posted by johngoulding View Post
    sorry forgot to mention , all my car has is as follows:
    hks blow off valve
    hks air filter
    hks exhaust (middle section and rear box)
    quickshift b&m
    silicone hoses
    everything else added is just big brake kits etc which i dont think would have any relevance to my problems.
    Try cleaning the MAF and see what happens.Also maybe try and pressure test the charge side of the turbo system.Maybe you have a boost leak.
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    Registered User JUSTINSNUTSWINGER's Avatar
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    No EM ???
    N-swinger

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    no boost leaks either , though i cant see why a boost leak would cause a missfire on all 3 ? and no i have standard engine management , whats wrong with that ? i know it would obviously benefit having aftermarket em but still dont think i would need it , maybe in future but not right now.
    this is gettin on my **** and i still aint found anything wrong apart from the coil packs are cracked at the end some of them anyway , getting replaced tomorrow , c what happens , i will go mad if it doesnt fix my problem

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    coil packs dont fix problem either ?

  11. #10
    Moderator Donkey's Avatar
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    Maybe try checking/cleaning the engine grounds or even go as far as adding a grounding kit.It could be an electrical problem.
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    spke to ma man at subaru spares in england ( andrew lord ) hes definately positive its an ignition problem maybe caused by the icu , ( ignition control unit ) or the crank sensor , when the coil packs were replaced after the car sitting around for a week not running it started fine after a few high revs it started misfiring again ? new icu and crank sensor coming tommorow by special delivery so hopefuly thats it , we also checked for bad wiring etc and everything looked good , although thats not to say that there isnt a problem somewhere in the wiring but as i said the car ran a good 30 miles at least running absolutely perfect it was only when i stuck the foot down this happened ? no boost or vaccum leaks , compression ok , wiring looks good , no check engine light , new sparks and coil packs , new timing belt , recon td04 turbo which is also in good nick , it wasnt the first time i put the foot down since i got the car back there were a FEW other times also and nothing seemed to happen then although i did notice that it was a bit poor through the boost in second but ok in1st 3rd and 4th never tried 5th , one thing also is that when we try turning it over u can hear it only firing on one cylinder but you also get a hell of a smell of unburnt fuel ? im getting to the end of my tether , hopefully the sensor or the icu fixes this as i have just about replaced every item in the bay and its burning a hole in my pocket , will post results if i dont hang myself due to high stress levels

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    cu an crank sensor didnt fix problem either , checked exhaust for blockage also but seems ok , dump valve making a hell of a noise , louder than normal ( when the car was last running ) and it seemed a bit low on power but there ar no leaks in any of the hoses or ancilaries , im getting code 35 on the cel which i think is the canister purge solenoid or circuit , i have heard of this code coming up when u dont put your gas cap on tight either , i know it sounds funny but its happened , the funnier thing is that the last place i visited was the petrol station , just to be sure can anyone tell me that if i havent put my gas cap on would this cause the car to suffer like it is for example not starting , slugish and cuttin out. i cant check my car as it is at the garage or any other sugestions on what it might be as i really dont think code 35 relates to a non starter or misfires ?

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    gascap son ? so what the fcuk is wrong , i give up

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    Moderator Donkey's Avatar
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    Maybe a vacuum leak?Don't know.I datalog my car to help diagnose problems.Makes it 10x times easier.
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    stupid idiot , went to garage to double check car for myself , turns out that its not code 35 the cel's flashing its 24, the idle control valve or circuit , why would my car be this bad though ? the engine was striped and put back again changing the fuel pressure regulator and a new crank sensor along with some new hose clamps ? idle control valve being bad normally causes a bad or sometimes a cutting out when idleing ? as far as i know , when the car was cold the car started after a few minutes it started to missfire then once warm wouldnt start at all , once it cooled it would start ? i cant see why an idle control valve would cause this problem though has any 1 ever heard of this happening before ?

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