1985 Nissan truck 2.4L 4x4 cam/distributor timing? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-06-2011, 03:26 AM
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1985 Nissan truck 2.4L 4x4 cam/distributor timing?

Just bought this truck that has been sitting in a garage for 4-5 years after the owner had the head welded, then he re-installed the head, but never got the truck running before he passed-on. That's all I know about it. It has symptoms of backfiring through the carb when cranking.
*This 2.4 liter 4 cyl motor has the Nissan 8 spark plug/2 coil ignition.
I brought the #1 piston to TDC and set the camchain timing as follows:
(With #1 piston TDC, checked via crank pulley timing mark and manually through spark plug hole with long screwdriver):
Cam = after exhaust stroke when exhaust valve has finished closing and the intake valve starts to open. At this point I checked the rotor position and it was pointing to #4 on the cap on both inner and outer rotor/cap contacts (dual coil ignition cap/rotor). (This firing order is 1-3-4-2 according to 2 sources I googled?). I also tried various distributor timing positions from advanced to where is was kicking back on the starter to retarded to where nothing happened other than flooding the cylinders.
But it still backfires through the carb. Is there something else I'm missing?
As always, thanks for any help!!!
Mike

Edit = spelling

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Last edited by mike 96 ws6; 09-06-2011 at 03:51 AM.
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Old 09-06-2011, 03:35 AM
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Also, I set the intake and exhaust valve clearances to .012" just for a starting point to try to rule out an intake valve held open from mis-adjustment, therefore causing the backfire.

And, I also switched the 2 coil wire locations between the distibutor but I still get a backfire issue.
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Old 09-06-2011, 10:51 AM
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Photos of my cam sprocket position are here. Note it has 3 different dots on the outer rim with numbers stamped beside them, and 3 numbers stamped towards the inside. I found that the #1 stamped toward the inside aligned at the top after I set the camshaft to the position I posted in my earlier post (exhaust valve finished closing / intake valve starting to open). I don't think this is right since there are 3 positions the cam gear will mate to the dowel pin on the camchaft, and those inside numbers obviously identify which dowel pin hole it represents. But none of the outer dots align at dead top when the camshaft is rocking on #1 cylinder (as already described).
I guess I'll go try it with each dot at dead top with #1 piston at TDC and see what happens. I'll post back if I find out anything further.
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