'86 won't run right
Posted 14 August 2018 - 10:49 AM
I got an '86.. nearly everything about the car is new or rebuilt, has the correct 1986 year components...
the motor is only able to start and run if you keep on pumping the gas pedal, in other words cannot get it to IDLE..
any help is much appreciated...THANKS!
Posted 14 August 2018 - 11:03 AM
I had this issue w/ a bad MAF
Posted 15 August 2018 - 10:16 AM
Posted 15 August 2018 - 08:07 PM
Hereís some items to check:
- put a fuel pressure gauge on top hat and verify 36-38psi
- try different injectors (2 x 850s is what you need)
- full TPS reset paying attention to setting the idle screw correctly (You mention only runs when you push the gas pedal, which opens the throttle plate... could you have the throttle completely closed at idle?)
- injector clips... find the clean wire on your injector harness and use new injector clips
- distributor: do you have a spare to put in? Several things with a faulty distributor connection or signal could cause issues, though typically you can crank and cant start the car at all
- plugs: pull them after the car wont stay running unless you hold down the pedal. Maybe theyíre flooded by a stuck injector.
- swap out for another MAP sensor, IAT sensor as mentioned above
- timing: this one will really mess you up. Be certain you have it 10 BTDC or at least in the ballpark between 0-10BTDC
Edited by Matt888, 15 August 2018 - 08:10 PM.
Posted 18 August 2018 - 05:51 PM
I had this issue w/ a bad MAF
Posted 18 August 2018 - 05:58 PM
New spark plugs of NGk correct type were just put on after the high revving. The timing was checked, the distributor is new, it has the 86 fuel injectors bought used but not tested, new Mitsubishi CTS the tps was checked but Iím not sure itís right. The injector clips were new also
Edited by stesir, 18 August 2018 - 05:59 PM.
Posted 19 August 2018 - 07:39 AM
Posted 20 August 2018 - 12:14 PM
I suspect a bad MAF, but the advice so far is very good. Ditto to all that's been said.
I once had an engine that did the same basic thing. It turned out to be a clogged air filter. All I did was change it for new, and it ran fine after that.
Could be a clogged fuel filter. Checking pressure should reveal that.
Theoretically, there should be some 'slop' in the accelerator cable and a proper TPS/ISC setting allows for a proper idle. However, if you can't figure it out, you can adjust the cable so the throttle plate stays open manually. This can allow you time to diagnose the real problem by keeping it running on it's own while you diagnose. It sucks when you need one extra person to keep it running while you try to find the problem.
Could be a bad FPR.
Could be a vacuum leak somewhere.
Traded for new set of tires for my wife's Buick: '87 TSI Gold that needs just about all steering and suspension parts replaced, injectors, a new transmission, clutch, and various electrical gremlins. New owner is a mechanic who is already driving it. I couldn't stand letting it sit any more!
'86 ESiR - OEM Roller Cam, Wiseco Forged 8:1 Pistons, Chad's equal length header, TEP T3/T4 turbo, ACT HD clutch, Fidanza Fly, custom 3" exhaust, 3 core oversized radiator, O-ringed block, AJUSA metal shim head gasket, Dawes Device boost controller
'85 Plymouth Conquest Auto , Wiseco 8:1, super light pins, shaved rods, hi-torque cam, 2.5 Exhaust
'84 Dodge Conquest Parts car
'83 Starion - Gutted stock exhaust with '87 TSi muffler, New engine with: BS Elim,forged Wisecos,balanced,Schneider274H,marnal w/oversized stainless valves
'83 Cannonball Run II Jackie Chan car, Basic ring and bearing job w/less than 6K original miles on body, steering, suspension, & rear end, Lightened stock fly, BS Elim, Walbro 255LPH FP, NEW Clearwater head with all new parts, intercooled, 14G turbo, 2750 car weight
'96 Mitsu Mirage w/rebuilt head. Gets 35+MPG.
'87 Dodge Ram50 4WD Rebuilt engine, fresh stock head, Weber carbed, BS elim. Runs great now!
'97 Buick Ultra (supercharged Park Avenue)
Posted 21 August 2018 - 03:21 PM
As far as the other things: BAD MAF- I know I put the correct '86 round plug in this a little bit ago, with the hard pipes in this you cannot get the aircan around it though..Fuel Filter- Hmmm. going to have to look into that, vacuum leaks I got to post up some pics so you all can see...a bad Fuel Pressure regulator, I'm not sure but been thinking about new trilogy turbo 1...I'm going to try some diff ECU's in it just in the meantime, '86, 89. it really revved w/ the '89 ECU in it with the old cts...so I'm curious what it will do w/ the new oem CTS
Posted 11 October 2018 - 06:33 PM
Some things though I should have gotten new but doing the best I can..no mileage on car with this restoration.
New fpr was put on, another fuel injector ballast resistor, front throttle body vac line moved to turbo wastegate instead of ovcp..
All the other things guys have mentioned are good except tps reset and suring up vac lines, fusible links ...
Ok it is starting every time, we bypassed fuel pump relay and it is doing the same thing, starts up but right away stalls out when you leave go the key from crank pos it shuts off...getting voltage to the coil in run pos ...it is not a bad fuel pump, we have good spark , new plugs the plugs were dry...the ecu is not the cars orig and I tried other 86’s and this 1 seems best but not sure of the grounding for it and know my fuse link red, green, brown wire aren’t right up by battery I keep forgetting that...thanks
Posted 12 October 2018 - 10:26 AM
On another note you say you tried a 89 ecu with out swaping the engine harness to a 89 style?
Edited by Evoz17, 12 October 2018 - 10:29 AM.
Posted 12 October 2018 - 11:36 AM
Posted 12 October 2018 - 03:55 PM
Probably because the TPS reset would needed to be performed with the ECU not having the learn procedure done.
Posted 20 October 2018 - 12:59 PM
But tried the 89 ECU in it again..before didn’t have about half dozen minor things done/improved on it, they were vac line moved to turbo wastegate from throttle body instead of on ovcp, new trilogy turbo fpr, couple correct colors fusible links put on near battery-green and brown...any way the 86 ECU Don’t Start the car it just cranks, the 89 ECU starts the car very strongly with high revving going 2500-3500 or higher all at once. Then will pretty quickly lose it stalls out... but can catch it with the pedal. I don’t think a tps reset has been done right on this car. I have boostmini’s tps on it, new.
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