igor Posted January 3, 2017 Share Posted January 3, 2017 Calling all the Falcon gurus out there. My 3.9 MPI coon is hesitating a bit sometimes like it's sucked some crap into the fuel system and it feels down on power slightly. Seems to come good at high revs. Is not overheating at all. I've had it three years and never run it right out of petrol. Low kms on the clock (not long clicked over 278,000). If it had a carby like the old ones I'd be confident to clean it out but never had anything to do with injection. All pertinent advice most welcome. Quote Link to comment Share on other sites More sharing options...
kyteler Posted January 3, 2017 Share Posted January 3, 2017 Don't these have garbage dizzy issues? Not sure if it was the 3.9 or the 4.0. I might have some impound ones coming available for me to pilfer parts from shortly if they end up going for scrap. Quote Link to comment Share on other sites More sharing options...
igor Posted January 3, 2017 Author Share Posted January 3, 2017 You believe the problem is electrical? Could well be. Probably should look at the dizzy cap first then? See if the contacts are eroded to nothing. That was the main problem when my XC started running on four cylinders. That and a couple of cracked spark plugs but the cracked plugs weren't always the ones not firing. What's the go with unclaimed impounds? Do they usually get tendered or is it considered not worth the hassle for shitters? Quote Link to comment Share on other sites More sharing options...
8ball Posted January 4, 2017 Share Posted January 4, 2017 From memory the dizzy is right under the intake and not the easiest to reach. So is the coil. So they're two things that are rarely touched. Have you tried some injector cleaner through it? Can sometimes help. Especially with good quality fuel like 98 octane for a few tanks. Think they also had issues with air flow sensor from memory and coolant temp sensors. Been a while since i played with one. Quote Link to comment Share on other sites More sharing options...
xsspeed Posted January 4, 2017 Share Posted January 4, 2017 How stable is idle? Quote Link to comment Share on other sites More sharing options...
igor Posted January 4, 2017 Author Share Posted January 4, 2017 It's always idled a bit high but it never bothered me. Not always evenly though. Sometimes idle speed will rise a bit just randomly for a while. I've always run 91 octane same as in my carby and throttle body injected coons. Serial coon driver since 2000. This is my fourth one and the others all ran sweet on 91. Quote Link to comment Share on other sites More sharing options...
chris r Posted January 4, 2017 Share Posted January 4, 2017 I'm wondering if it's a intake manifold gasket? Could try squirting some circumstances/engine start around the manifold flange. Failing that check dizxy/ht leads and coil. Possibly old and tired now and not often touched Quote Link to comment Share on other sites More sharing options...
igor Posted January 4, 2017 Author Share Posted January 4, 2017 Thanks for all the thoughts guys. Now I need a day when it isn't raining or blowing like forty bastards so I can look into it. Quote Link to comment Share on other sites More sharing options...
igor Posted January 4, 2017 Author Share Posted January 4, 2017 Just had a look at this while the weather was good. What stupid bastard designs a thing with the dizzy hidden so far up under the manifold that you can't even see both cap retaining clips much less reach them? Far worse than putting the alternator directly under the power steering pump so it can fill up with leaked oil and fuck itself. Air filter looks disgusting so that'll get replaced first then a dose of injector cleaner. Anyone recommend a good product for this please? Quote Link to comment Share on other sites More sharing options...
Unclejake Posted January 5, 2017 Share Posted January 5, 2017 As idle is off perhaps check all the heater controls are working, and if not check for a vacuum leak There's various hoses that can fail, including one between the back of the head and the firewall. Quote Link to comment Share on other sites More sharing options...
8ball Posted January 5, 2017 Share Posted January 5, 2017 Nulon or valvoline injector cleaner is always in cupboard at work. So one of those 2. throw it in with 98 octane fuel. As said above spray some start ya bastard or such around the intake to head gasket area and listen for changes in engine conditions (may stall even if bad) I cant recall exactly but didn't these have a bad issue with air flow sensors etc?? Get real dirty etc and tun like a bag of cats? Hahaha yes the dizzy location is a nice touch lol. Just be lucky its not a dick Johnson special with a turbo hanging off the side ... Cant see or reach squat thanks to the intake pipes etc. Quote Link to comment Share on other sites More sharing options...
igor Posted January 5, 2017 Author Share Posted January 5, 2017 Heater works fine UJ but will check hoses anyway. Thanks for that 8ball. Will try that. Can't get 98 around here though. How much difference does it make? Totally unkeen to take the manifold off to reach the dizzy. This is why I love old pushrod dinosaurs with a carby. Quote Link to comment Share on other sites More sharing options...
8ball Posted January 5, 2017 Share Posted January 5, 2017 We just found as the fuel system "de-gummed" itself the quality of the fuel degraded (obviously ) and could cause other issues. So running a better fuel assisted this. Also by just running 98 for 2 or 3 tanks every few months can have a similar effect as injector cleaner (once the fuel system is cleaned up) ** by no means is injector cleaner a substitute for actual cleaning and testing of injectors. Also i advisea fuel filter swap. Usually after the cleaner or any crap in the tank will just dislodge and gunk up the new filter. If you're pedantic you could do a new filter drop in the cleaner and then replace it again after. Some people believe that the cleaner can dislodge crap from a semi blocked filter and allow it to find its way to injectors etc. ? Quote Link to comment Share on other sites More sharing options...
8ball Posted January 5, 2017 Share Posted January 5, 2017 Aussie speed do a manifold conversion to carburetor for them if you hate injection that much... Or find a 3.9 cpi manifold and bung a holley/weber 2bl carb onto it. 1 Quote Link to comment Share on other sites More sharing options...
igor Posted January 5, 2017 Author Share Posted January 5, 2017 Sounds like a huge fuck around to do the conversion but it is an interesting thought. Surprised it is popular enough for a conversion kit to be made. As it happens I have two throttle body injected EAs and an XC here. What're the odds the XC carby will fit on the EA manifold without mods? Is the conversion for speedway/stockcars? Quote Link to comment Share on other sites More sharing options...
xsspeed Posted January 5, 2017 Share Posted January 5, 2017 get a barra in ya Quote Link to comment Share on other sites More sharing options...
8ball Posted January 5, 2017 Share Posted January 5, 2017 Yeah they used them for speedway. A barra..... he doesn't want to pull intake off and you sugest a barra conversion lol. Now that's a lot of work. .. want to be pretty attatched to the ea etc. Easier to just grab a ba/bf etc lol Quote Link to comment Share on other sites More sharing options...
igor Posted January 5, 2017 Author Share Posted January 5, 2017 My boss and his dad tried a BA when they first came out and reckoned it was too tight across the shoulders. They are both pretty big guys though. Be more inclined to do a V8 transplant than a Barra into an EA given the choice. Mate at work regularly gives me cheek about my six cylinder coons. Reckons anything that big needs an 8. He is of course biased as he's on at least his third V8 coon. Quote Link to comment Share on other sites More sharing options...
8ball Posted January 5, 2017 Share Posted January 5, 2017 He's obviously never driven a healthy turbo barra. Or he'd prob be pale as and stink of shite... instead of just dribbling it lol 1 Quote Link to comment Share on other sites More sharing options...
Valiant Posted January 5, 2017 Share Posted January 5, 2017 You've got a multi point injected one? Use a long thin screw driver to flick the clip off the distributor coming down from the top and twisting the clip. Take the whole cap and leads out at once, you'll have to wriggle your hand up under the intake to get the coil lead off. It's not fun but you can do it! Quote Link to comment Share on other sites More sharing options...
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