1993 nh pajero 3LTR is running on 5 cylinders, i have changed the plugs,leads,dizzy cap,rotor button,lifters. you can pull number 1 lead off the plug and there is no change in the running of engine you pull any of the others off and it runs worse,which means number 1 is not firing. i have compresion number 1 plug sparks from lead, so i dont know what else to look at to fix the problem i also checked to make sure i had power to the injector. CAN YOU PLEASE HELP ME WITH THIS PROBLEM ANYTHING COULD BE A BIG HELP THANKYOU
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Re: 1993 nh pajero 3 LTR running on 5 CYL
Hi Roy, You say you have compression? is it well within the range of the other cylinders? if it is i.e. around 100 psi then possible bent or sticking valve? although you have a spark when plug earthed out of head is there possibly some foreign matter isolating the plug or is it the plug itself breaking/tracking down when in situe? Failing all these, try a small amount of fuel direct into the cylinder to see if it fires briefly (Not too much just a couple of mls) Maybe possible Head gasket failure? (I doubt it as all other cyls fine) Can't think of anything else I would try, Hope this helps! Paul 'W' Onyer~EDson(:0)~[><U.K.
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There are 2 3.0L engines used in 1989. One has a flat distributor cap with the plug towers coming out sideways and the other has a conventional cap with the plug towers protruding vertically. Both have a firing order of 1-2-3-4-5-6 (Gee, that's hard one to remember!... LOL ;) ) The ditributor cap should have the cylinder numbers cast into it at each plug tower - most Mitsubishi caps do. The cylinders are numbered 1-3-5 on the right bank and 2-4-6 on the left bank.
the firing order on 99% of 4 cylinder engines is 1,3,4,2. look on the distributor (dist) cap and see if it has any marks like a line or a #1 by on e of the plug wire towers. start with that one and then go in the direction the distributor rotor turns. attach wires one by one in the order 1,3,4,2 . to find the direction of rotation take the cap of the distributor and have a friend crank engine for 10 sec. no1 cylinder is in front of engine, i think it is on the right side on the Fiero, where the belts are. if no markings on the dist. cap remove no1 plug and get ti to the top on the compresion stroke ( both valves closed) and see where the rotor in the dist. ends up that is your no 1. hope this helps.
no your problem is definately the dizzie cap, as i found out to my cost on a lansia beta. any kind of crack in ur dizzie will cause probs. best way to find out is park your car in the dark open bonnet with engine running then get a mist spray with water in it spray at dizzie and you will see a slight yellow arc around the crack! any crack in bakelite distributors leads to loss of one or more banks
Changeout the rotor button and cap. the cap has carbon pins under there and wear down from the rotor button. The rotor button sits on the distributor which is easily pulled off. When removing these be sure the plug wires stay in order, Also, use di-electic grease on the plug wires, prevents moisture getting there and run away sparks. CAP/ROTOR button $20 approx.
The firing order is 1, 3, 4, 2. If all the leads have been pulled off the dizzy cap, you'll have to remove No 1 spark plug (leave it threaded into the plug hole by 1 turn) and the dizzy cap. Turn the motor over by hand in the clockwise direction and listen for air being forced out of the No 1 plug hole. When you start to hear that, it means you are approaching TDC on No 1 cylinder. Now look at the front crankshaft pulley and stop turning the engine when the mark on the pulley is close to the marks on the timing belt cover. It doesn't have to be exact (unless you've removed the dizzy). Now where the dizzy rotor is pointing is where No 1 lead has to be fitted. Observe the direction of rotation of the rotor and the next point it comes to will be where you fit No 3 lead; No 4 lead next; and finally No 2 lead.
remove the dizzy cap, crank motor over to find out the rotation of the rotor. Remove the no.1 spark plug and bring no.1 piston up to top dead centre on compression stroke, mark side of dizzy body where the end of the rotor points to, replace dizzy cap and see which lead it lines up with.
that will be your no.1 lead, find the firing order and put the leads back on the dizzy cap in the direction of the rotors rotation, run those leads to the corresponding plugs and it should start.