beaterjeep Posted January 2, 2007 Share Posted January 2, 2007 Well, I went to go pick up a friend last night (before drinking) and when I went to go fire the truck up to let it warm up, it acted like it didn't want to start. Finally after almost 10 minutes of monkeying around with it, I finally just put the gas pedal to the floor and it started to start, so I tried it again and it finally started. On the way there the truck was running real bad, coughing, sputtering and almost died a couple times. On the way back from picking him up, I got to a stop sign and started to take off, I got up to about 45 mph and all I hear is a big BANG from out the tailpipes, and the truck just died. Tried to restart and no go. Pulled off on the side of the raod to take a look under the hood, and all we smelled was gas. Upon further investigation I come to find out that there is also gas in the oil because the dipstick smelt more like gas than the carb did. Any ideas on what could be going on here? I just had the fuel pump and filter changed out less than 3 months ago, and I think I'm looking at a lot more money to fix this problem. Please help me out as I now have no vehicle to drive. Link to comment Share on other sites More sharing options...
Eagle Posted January 2, 2007 Share Posted January 2, 2007 Step one, if you smell gas in the oil, is change the oil. Throw in cheap Wal-Mart stuff if you have to, but get the gasoline out of the crankcase. Then start diagnosing. My first reaction was that your CPS went bad. That controls ignition, timing, and injection pulses. If your rings are worn and a lot of gas was going into the cylinders and not getting fired, some would leak down past the rings. The Big Bang was probably the swan song of your catalytic converter, when all the unburned raw gasoline hit the hot catalyst. However, I think you also need to check your compression, just to be sure you didn't burn a hole in the top of one of the pistons. That could also account for gaslone in the crankcase. Link to comment Share on other sites More sharing options...
feerocknok Posted January 2, 2007 Share Posted January 2, 2007 My father mentioned something about the gasket between your intake manifold and head. Anyone able to make sense of how that works in? Link to comment Share on other sites More sharing options...
aemsee Posted January 2, 2007 Share Posted January 2, 2007 Are you talking about the V6 carbed one? Could just be the choke plate isn't opening up due to a bad choke coil. Or the float could stuck, or the fuel needle could be stuck. Not real common on the crap varijets, but the bad choke is common. Link to comment Share on other sites More sharing options...
beaterjeep Posted January 2, 2007 Author Share Posted January 2, 2007 Step one, if you smell gas in the oil, is change the oil. Throw in cheap Wal-Mart stuff if you have to, but get the gasoline out of the crankcase. The Big Bang was probably the swan song of your catalytic converter, when all the unburned raw gasoline hit the hot catalyst. Well, it's got it's own kind of "self changing oil" via a leaky rear main seal, but as soon as I get it back here, I will definitely be getting the old oil out. As for the unburned gas hitting the catalyst in the cats, I uh kinda don't have any on it. I still haven't had a chance to put the cats on since I bought it from Alex (GIRsMJ86) so everything is just as he had it. Are you talking about the V6 carbed one? Could just be the choke plate isn't opening up due to a bad choke coil. Or the float could stuck, or the fuel needle could be stuck. Not real common on the crap varijets, but the bad choke is common. Yes, it is an '86 X 4wd with the 2.8L V6 that has been bored out to a 3.2L. I asked a couple of my friends that know more than I do about carbed motors and they too mentioned the possibility of the choke sticking open, they also all seemed to think that there is a possibility that one of the head gaskets was going bad to begin with and the combination of the bad head gasket and the choke stuck open caused an explosion inside the motor that just resonated through the tails. As a result they also seem to think that I may have cracked one of the heads. Does any of this sound logical/possible? I took a closer look at it this morning and I also know for a fact that I must have had flames out the pipes because the comanche club sticker is on the bumper on the left side and it has part of it burnt off and has carbon buildup around it. Hope this bit of info I forgot to metion in the first post helps to better diagnose this. Link to comment Share on other sites More sharing options...
aemsee Posted January 3, 2007 Share Posted January 3, 2007 Actually, it would be the choke stuck closed. Change the oil, change the plugs and fire it up with the air cleaner lid off. The choke plate should open up about an 1/8 inch immediately by the vacuum choke pull off. As the engine runs the choke stat will start to open the plate up the rest of the way. There should be a single wire running to the choke stat. Check it for a good 12 volts with the Jeep running if the choke doesnt open up. The back fire and flames could have just been from excess fuel in the exhaust, if you are lucky. I've seen mufflers blown wide open from this same situation. Keep us posted. Link to comment Share on other sites More sharing options...
beaterjeep Posted January 3, 2007 Author Share Posted January 3, 2007 Well, just went out and picked up the truck from where it was sitting, so as I'm writing this it's on it's way to the shop. I took a look underneath and the glasspacks and the rest of the exhaust looks good still, so it didn't blow out. On order is a new set of plugs, wires, cap and rotor, as well as a good oil changing. I was already planning on doing the plugs, wires, cap and rotor this month anyways, so now it's gonna get done no matter what, as when I went to pull one of the plug wires off to check for spark, the metal piece that holds the wire to the plug decided to stay on the plug and all I got was an empty boot. I will find out what all is wrong with it tomorrow after it gets looked at. Hopefully it's nothing too serious. I'll keep you all posted. Link to comment Share on other sites More sharing options...
beaterjeep Posted January 5, 2007 Author Share Posted January 5, 2007 Well, just a lil update. I just heard from the guy I'm having work on it, and he said he got it to run today but it died shortly after. He had to play with the timing to get it to even start and then when he tried to advance/retard it back to where it should be it died again. Also, he is going to be taking all the pollution control crap off of it, as (IIRC) it's not really needed. He also said that the distributor and a lot of other key things were very loose under the hood, and tightened them down to what the chilton's recommended. So far his thinking is that I just got some bad gas, like from a mislabeled E85 pump, although I still haven't seen an E85 pump around here. So for now anyways the mystery stays just that, a mystery as to why it's not running right. Link to comment Share on other sites More sharing options...
GirsMJ86 Posted January 5, 2007 Share Posted January 5, 2007 man with all the trouble you are having with her and all the money i have spent on the 91 i almost regret getting rid of it. maybe i should have just made a 4.0L HO fit and been done with it. o well i guess. hope you manage to get it straightened out. and i bet if you ever manage to get that oil leak fixed and all the little bugs out of it it would run like a scared race horse. Alex Link to comment Share on other sites More sharing options...
beaterjeep Posted January 9, 2007 Author Share Posted January 9, 2007 Yep, as the new title implies, my '86 is back and running. It turns out that there were a lot of loose parts and bare wires under the hood. The ignition coil was also bad and has been replaced as well as a new distributor, plugs and wires. She's gonna be delivered to me tomorrow, 1/10 :jump: :cheers: :driving: Link to comment Share on other sites More sharing options...
GirsMJ86 Posted January 9, 2007 Share Posted January 9, 2007 let me know how much better it runs. just my luck, thats all it needed (other then the oil leak). good luck and have fun with her. Alex Link to comment Share on other sites More sharing options...
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