I have a "found on the floor" Holley carb on my 258, (89 wrangler) which was made in 1980 for a Dodge 318 that the previous owner threw on for a quick sale. The wiring and vacuum lines are all jacked up but i think this issue is beyond that. Anyway, ive been blaming the carb all along for it falling on its face when i go beyond that sweet spot on the pedal. Well, after doing a head job i thought hey, lets shoot some carb cleaner in there and see what happens. Holy crap it's running like a raped ape! All response, all rpm's! EXCEPT... for when i get in 5th gear I cant cross 65mph. It jerks and barks back at me. Im thinking maybe timing? I plan on getting a new carb of course, just want an easy fix so i can enjoy it for the rest of the season. Thanks for PRACTICAL suggestions! (no vacuum psi or crankcase pressure revolutions type suggestions needed)!
well it seems a lil better after adjusting the timing, but is still present. Looking around the engine, I appear to be missing a lot of stuff. I do not see an egr valve, the CTO sensor is capped off completely, etc etc...
So I am going to go in another direction and look for just what exactly should be inside my engine compartment. Then I will work on verifying electrical connections and especially vacuum connections. I have the serial number off the block and so far am not having any internet luck.
I also found Jeep's website where you can enter your vin number for wiring manuals, body repair manuals, owner manuals, etc... But it's telling me that I am entering an invalid VIN. wtf!
This is just what I was looking for. Thank you very much! What it means however, is not what I was looking for. This means that the PO had the motor rebuilt, (good), but threw out all the useless parts rather than installing them. Not to mention reconnecting any of the wiring.
Well I think ill probably take any bolt ons off of the engine and start getting that thing to resemble the picture. No sense in trying to diagnose performance issues when all the sensors are missing and over half of the electrical and vacuum are dead end connections. Thanks again for the link. Whoever made that spent some hours.
also, i can punch in my vin on Jeep.com and get all kinds of goodies like wiring catalog, body part replacement procedure catalog, etc. However the site wont recognize my vin. Probably too old. Which sucks cuz those would have been great service manuals. Haynes isnt cutting it for me on this project. I n Haynes I get alot of "If Equiped" statements, where i need to know "If Equiped".
Yeah, 1979. When they added the computerized emissions sometime in the early 80's, they just added more stuff (computerized timing, a computerized carb and all the sensors etc) on top of the old engine. The old 1979 or so engine is still underneath there.
For the computerized system to work right, it all has to be there and working right. That's never going to happen for you.
So, do the Nutter bypass (which bypasses the computer) and then tune it like it is a 1979. It is what lots of people do. Mine was totally stock and had all the parts when I bought it, but hadn't been maintained, so that's what I did. It had very similar symptoms to yours, which I suspect was a failed knock sensor among other things.
The 1970's ones did have the CTO, Vapor Canister and EGR valve. I'd try to put those back if it was me, because I care about the environment if it is only a hundred dollars or so, but others will have different opinions. But get it running right first.
Another viable choice is to buy the kit and convert it to TBI fuel injection or do the junkyard parts equivalent. I have no first hand experience with that. But you'll never get the stock system to work without the stock carb and an unbelievable amount of screwing with it.