1986 Plymouth Conquest TSi Vin N?
I own an 86 Conquest that i got for a steal at $1900 and it’s pretty minty fresh. It only has 103,000 miles on it and everything is all original. It has a few minor spots of rust but nothing at all for an 86, the frame and underbody is solid. But down to the point:) I was driving it home from buying it and the guy told me it had a rod knock and that i should sent the crank out soon to get machined and then fitted with oversized bearings. Well aboot a half hour or so of driving, a tiny knock turned into a huge conundrum riddled with plumetting oil pressure, severe turbo lag, and the most ungodly knock ever. I pulled over to check what the hell was up. It managed to overheat because of a loss in oil because a quart or more was gone. Well i decided to spend the $60 to rent a uhaul trailer the next day to stop from hurting her anymore. So after that me and my dad thought the oil pump went out. I took off the valve cover to notice some adjustment screws missing but learned that these were just for the jet valves. We tried adjusting them and noticed that the passenger side rockers and one drivers side rocker weren’t spitting oil. We further took the rockers off to find that the valve adjustment plugs (i like to call them spring loaded jelly beans) were solid and just knocking on the valve springs, this was the knock. So i bought 8 new ones for $20 a piece, thinking i had the problems all solved. They came the next day and i put them in. I put it all back together and noticed that it would knock, then stop, then knock again and so on. So dad takes the oil cap off to feel the pressure and it’s like a damn exhaust pipe on the top end of my motor. There is a pretty plentiful vent of air pushing out of the valve cover. So, we boiled it down to either valves, valve seats, piston rings, or the pcv valve. I took the plugs out and they are all fouled black as hell from burning oil, but it isn’t enough for the exhaust to blow smoke, but it does burn oil and it either leaks in through the valves or past the rings. I tested the compression on the rear piston but it was 75 the first time and then 100 the second time. I know that can’t be right at all. I figure it’s supposed to be around 200 but i’m not sure. Does anyone know how many foot pound of compression i should have per cylinder? I’d like input on this because I can’t find any help online and i can’t find a repair guide even though that wouldn’t help much. Someone told me it could also be some worn seals in my turbo, causing air to run through the oil lines and come out in the valve cover, but i think my compression test shows it’s a ring or valve problem. Also, what’s the difference between the Vin H model and the Vin N? I feel like and idiot for asking but is there a difference besides a letter? Thank you for any help:) I just really need to know the numbers for my compression in each cylinder. I’m checking all 4 cylinders tonight. Thanks
i am definately not selling it and i know where to look for parts. I can get them all but i just need to know the compression so i can pinpoint the problem. Mine just sat. And there is no reason to sell it because i recently bought it and it’s worht over $4000 in its condition and i’ve always wanted one. I have no problem getting parts. I go to rock auto or advanced and even on forums and i could pretty much build a new one with parts
lolz
there’s no way i’m getting rid of it
it’s too nice and rare
that’s why i want it
to show everyone what’s up and not to be every ricer kid out there with a civ, 240, or dsm
Excuse me? SMD!!! I know exactly what i’m talking aboot and i want to see you find one of these in fair condition for under 3 grand!!! and it valves or rings, we have it all apart and they are both bad from sitting and then overheating. i bet you i could tear down my entire before you can change the oil. Why don’t you learn how to speak to people instead of being an old wrench turning highschool dropout!! eat a dick


I would go to car-part.com and price a engine. I had an experience with a Conquest and went through hell trying to find parts(Who would of thought that the pulse regulator of the fuel pump is discontinued and can only be found on the fuel rail on late model Honda engines?). Everytime I fixed one thing another nightmare popped up and guess what-the part was discontinued.Nobody in the US had a stupid headlight switch-all junkyards had broken switches.Power steering pump-had to wait a week for one. All that I’m saying is that the Conquest is a car that everything is becoming obsolete for parts. I would get the car running and SELL it to save yourself the headache of nightmares trying to find parts for it.
Nice story, should have started out “Once upon a time” You have an old POS. Save it long enough and you can use it for a coffin to be buried in. By the way, you don’t have a clue WTF you are doing. From what I’ve seen you have a better chance at being a writer than a mechanic. Hire a professional to completely overhaul the car or junk it.