mrsinister Posted February 22, 2011 Share Posted February 22, 2011 Any ideas? 86' Manche with 66k. 2.8L Obviously each one is probably impossible to diagnose over a forum, but together maybe you can see a pattern i am not experienced with. 1. Car has been idling roughly lately... like for last 1000mi (yeah i know tsk tsk). When driving its great, just not when idling. [most tune-up type items have been replaced in last 5k miles] 2. last few hundred miles my oil pressure gauge has been wacky. ill be driving along, minding my own business, and look down and see the guage pegged to the right... after i slow down, or sometimes on its own, it will just swiftly shoot back to the normal center... 3. Last couple days, (and getting worse)... whenever i shut it off after driving it for a while, it tries to run for a second or two, tonight it ran for a good 3 seconds after turning key off. [ best i could find from google is "dieseling" ideas? thoughts? Thanks! Link to comment Share on other sites More sharing options...
SubSonic Posted February 22, 2011 Share Posted February 22, 2011 Sounds as if it could be computer related. Check your grounds, and make sure the oil pressure sender connection is good. Hopefully someone else has more insight. Link to comment Share on other sites More sharing options...
deziped Posted February 22, 2011 Share Posted February 22, 2011 On a carbureted 86, well, maybe your plugs are running hot and cooking off some fuel slipping by a worn out carb for the few seconds it takes them to cool off after the elec. is cut off. Bad needle valves maybe? I dun-no....... Link to comment Share on other sites More sharing options...
SubSonic Posted February 22, 2011 Share Posted February 22, 2011 Ooops, should have looked closer at the year... disregard my last post. Link to comment Share on other sites More sharing options...
shelbyluvv Posted February 22, 2011 Share Posted February 22, 2011 You need a new carb. They are junk to begin with. I just junked a good running 2.8 with a freshly rebuilt carb on it. Link to comment Share on other sites More sharing options...
tbrand Posted February 23, 2011 Share Posted February 23, 2011 I pulled a carb off an '86 2.8 that the PO said was freshly rebuilt, but had no documentation. If you want it, it's yours for the cost of shipping. Link to comment Share on other sites More sharing options...
mrsinister Posted February 23, 2011 Author Share Posted February 23, 2011 PM'd! With the carb acting up, would that have any correlation with the oil pressure? or is that probably a separate issue with similar timing. appreciate any help folks! thanks so far! Link to comment Share on other sites More sharing options...
mrsinister Posted April 24, 2011 Author Share Posted April 24, 2011 Ok, finally installed the carb that Tbrand graciously donated. It took me forever to find the time, and then even more time to get a gasket in. (which turned out to be wrong anyways) and a lot of elbow grease today. Pros: New carb seems to help the car run smoother. Not sure how to quantify, just smoother.\ Shifts better... How this has anything to do with the carb is beyond me Cons: Needs to be tuned, pulls wayyy too hard. STILL Chugs along after being turned off. So, it may not be the carburetor after all any more ideas? Link to comment Share on other sites More sharing options...
jimoshel Posted April 24, 2011 Share Posted April 24, 2011 A hot spot in one of the cylinders. A piece of carbon is glowing red hot and acting like a glow plug in a diesel engine. Try one of the carbon removers on the market, or remove the head and clean off all carbon from the head chamber and top of piston. Also at the same time you turn the key off tromp on the gas pedal. The sudden intake of air will kill it. Link to comment Share on other sites More sharing options...
86FUBAR Posted April 24, 2011 Share Posted April 24, 2011 My 86 with the carbed 2.8 did the same thing when I ran anything less than mid or premium grade fuel in it , now that I have the 3.4 swapped it will still do it if I run the cheap stuff . The truck sits more than it gets driven so I always put premium in it . Try running some premium fuel with some octane booster to clear it out . Make sure the timing is set right and that the 4 pin conector off the dizzy is disconnected wile checking / adjusting . The carbed 2.8 does infact have a computer Link to comment Share on other sites More sharing options...
mrsinister Posted April 24, 2011 Author Share Posted April 24, 2011 thanks! Ill try both of those solutions./ Link to comment Share on other sites More sharing options...
mrsinister Posted April 27, 2011 Author Share Posted April 27, 2011 SOLVED! Sigh, i'm learning, so don't beat me up too bad. I couldn't figure out why it was surging so bad, and coughing when i turned it off. and your suggestions were great. So i buried my nose back in the Chilton. Looked at the Carb Looked at the Chilton. Looked at the carb. sigh. somewhere along the line, my throttle return spring must have broken. Never noticed it was gone. $6.82 later. 10 seconds of install time. life is good. In fact, better than before. Way better power delivery. Idles wonderfully, and now that the throttle plate closes. No cough. Woo! Ridiculous. the little things. Link to comment Share on other sites More sharing options...
jimoshel Posted April 27, 2011 Share Posted April 27, 2011 Any idiot can find something big. It takes real talent, skill, perseverance, dedication, training and sometimes dumb luck to find the little things. :cheers: Link to comment Share on other sites More sharing options...
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