1985 Ford Bronco Failing - Engine

Question: ok here we go i have a 85 bronco i originally pulled it into my garage cause it was running weak it just happen one day driving down freeway so i got it home and did a compression check turned out two cylinders had no compression so i pulled the heads and it had a blown head gasket so i replaced gaskets and machined the head got a whole new gasket kit put it all back together while i was at it i changed the injectors with some accell 19 pounders put it all back together and it started up find for all of 2 seconds then it started dumping smoke i dont think its oil or coolant but its smells almost like varnished gas but gas is new but does have no heet water remover thinking maybe i had water so it smells almost like a diesal i did do another compression check thinking it might be rings but that one was all within 10 percent of eachother so compression isnt bad i thinking it could be valve timing or a gloged cat but do those explain for smoke any help would be greatly appreciated also all sensor except tps are new also change wires plugs cap rotor recently put msd coil and also control mod is new wanted to check fuel pressure but unfortunately no shrader valve on the fuel rail/ more about the motor im not sure if its a 302 or 351 all 302 gaskets lined up but you never know also motor has been bored .040 over kinda a frainkenstein motor when i got it

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Technican: O.K. you say there was smoke and a smell. If the smoke was white and the smell kinda diesel like(kinda rich and sweet), when you blew your head gasket, you must have got some kide of fluid in your crankcase(antifreeze). If you did'nt do a complete flush of the motor, its' still circulating in the system. Antifreez can and will stay around for a long time(thats' why its' deemed a toxic waste). If you have'nt already done so, flush your motor with a good motor flush(your local parts house should have it) change out your oil and filter. It may be an old wifes tale to some but antifreeze can and will cause internal bearing and seals that were not meant for the stuff to fail. Paul

Owner: i already did a motor flush and changed the oil 3 times in the last week my motor has never been so clean before the only other possibility is that coolant got into the exhaust would that cause it but ive run it for up to 15 minutes and the smoke getss thicker and thicker ive also done i half assed coolant pressure check with a vaccum pump on the over flow of my radiator.

Technican: What color is the smoke, black or white? If you have EFI which you indicated to me by saying you changed out the injectors, you should also have an internal cooler that goes to the intake that may be dumping fluid into the exhaust causing a white sweet smelling smoke. If its' black, your burning some type of oil. Yes there is a possibilty that there may be some type of fluid still collected in your exhaust system. Normal condensation can be expected, but an excess as described needs to be pinpointed. You state you did a vaccume check on the cooling system, now try a total pressure test under opperating conditions. This should tell if the system under normal operating temperture is releasing any unwanted fluid into the exaust. Paul

Owner: the smoke to me looks white but im sorta color blind but i had my wife check and she said white also you said to do a pressure test how do i do that other then just running the motor?

Technican: Check with one of your local parts houses(Pep Boys, Auto Zone etc.) I understand they have what you need for free or a nominal price. Just tell them you need a coolant system pressure checking tool. If you have'nt replaced the radiator cap, it should state on it what pressure should be. If it dosen't refer to a manual or the parts house to see if they can give you factory specs on pressure level. White smoke tells me there may be some fluid left in, or still seeping into the system. Paul

Owner: ok i have the pressure tester on there been there for about 5 minutes hasnt dropped yet but im waiting to if it does later but also i am curious you seem pretty sure that it is coolant in that case there are two other possibilitys right either coolant in the oil or cooolant in the fuel am i correct?

Technican: Yes. This is why I'm directing you to do the pressure test. As I stated earler, I believe you have an intercooler that runs thru your intake, thus making it possible for your intake to be recieving unwanted fluid from your cooling system into the combustion chambers causing the unwarrented smoke that you are describing. You say you had the heads machined. Did they do dye test to make sure there were no cracks or fisures when doing so? The slightist of either can cause this under normal operating temps. Paul

Owner: ok i ran the coolant pressure test for 5 hours didnt drop the slightest yes there were pressure checked and manafluxed so im pretty sure heads are ok i droped a quart of fuel from my fuel line thinking maybe there was water in there and there was so i drained the whole tank and filled it up with good supreme gas now it runs great but its loping like my camaro which has a race cam and all that fun stuff and its running rich blowing black smoke instead of white which is an improvement to me now it atleast runs enough it could be driven if needed to i hooked up my vaccum gauge to the intake and ran it its a little low running about 15 when i stomp it drops down to 0 then up to about 25 then slowly back to 15 still loping any ideas? its an on going project and the sad thing is i need to sell it within a couple months due to the fact im moving back to hawaii kinda a bummer im starting to really like this truck lololol

Technican: O.K., you have changed all sensors but the TPS. How about your mass air flow sensor? By the sounds of it, you're running on the rich side and one of these could be a problem. Best thing to do is have the vehicle hitched up to a diagnostic scanner and see if any codes can be retrieved(I understand Auto Zone, Pep Boys etc. will do this free or at a nominal charge) If a code is retrieved, follow the flow chart if they can provide you one or point in the right direction to obtain one. Paul

Owner: ok i work at pepboys and own a scanner so ill do that when i get home tomorrow my truck doesn have maf sensor but does have map sensor which is new but vacuum line is not ill let you know if codes pop up or not thanks again

Technican: Havn't heard back from you so i'm taking it you must of had some type of luck. If not, keep in touch and we'll keep at it. Paul

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1985 Ford Bronco Failing - Engine

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