Stumped on KA problem

ONLY for ADVANCED technical discussion about the 240sx!
Tomslide50
Posts: 4
Joined: Wed Mar 09, 2005 3:29 pm

Post

It's a 91 ka24de. I had the head rebuilt, replaced rings and rod bearings, did timing chain tensioners and after putting the motor back together I can't get it to start. It turns over but it doesn't even sputter. there's no combustion what-so-ever. I have verified 3 times now that the mechanical timing is exactly how it should be. I have used the marks and counted links and it's perfect. The distributor is in correctly (not 180 off) and it's set to 20 btdc. There's fuel pressure in the rail and I spun the distributor and heard each injector click on. Each plug has been pulled and verified for spark. Battery has been freshly charged several times from all the cranking I've been doing. I put the ecu in diag mode and got 55 meaning everything's ok. I have tested all the necessary inputs and outputs for starting as outlined in the FSM and everything checks out. I have tried pouring a little fuel in the intake manifold, but nothing. I have tried holding the throttle full and part open while cranking. I have done everything I know of to do and it doesn't even want to sputter. It's not even close to starting. I don't have a compression tester here but like i said the head was decked and the head gasket torqued correctly, and when you bump the motor over it pops your hand off the plug hole so I don't believe that to be the problem. Even if it was compression it should still sputter. It should try to catch and run like *** but atleast do something! I don't even get the sound of it wanting to catch. Not even a backfire! I have fuel, spark, correct mechanincal and ignition timing and am at my wit's end here. It has new plugs and i just cleaned the fuel off of them from all the unsuccessful cranking and still nothing. I know i'm probably going to get responses like "well if it won't start then you don't have all those things" but everything has been verified several times over. Where do I go from here? Please help!


180fan
Posts: 7799
Joined: Sat Dec 14, 2002 12:16 pm
Car: 89 fastback

Post

if you're positive you've got spark and fuel, it has to be with timing. Unless you've got something weird going on with your mafs giving the ecu bogus readings.

User avatar
smokin240
Posts: 797
Joined: Fri Apr 30, 2004 3:55 pm

Post

I say this alot, but it is a common problem. When I first did my swap I couldnt figure out why the hell mine wasn't starting either. It ended up being my grounding. Make sure everything is hooked up, tight, and on correctly. The procedure to make sure your grounded well is just take a multi meter and hook it up to the negative terminal and other end on an unpainted body screw, it shouldn't be over 2 ohms.

Also, you say the plugs have a good spark and your getting fuel, do the plugs smell like fuel? If your cranking and it's not firing they should smell of it. Because honestly it sounds like the injectors are f'd up, either that or your timing is still off. I wouldn't go by the markings on the pulley for now, just turn the dizzy one tooth at a time each time trying to start the car. If you hit the correct tooth it will start to fire, if not run well. Then just turn the dizzy itself to find that sweet spot.

ken240sx
Posts: 1119
Joined: Thu Mar 31, 2005 7:00 pm
Car: '92 KA-T 240sx, '08 Vette + Spray, '09 Benz C300, '98 Trans Am + Cam & Spray, '03 Acura TL Type S

Post

goin out on a limb and gonna say check something simple like the starter, bring it down to the closest auto place, they will usually be able to bench test your starter. but first like it has been said, check the grounds again and again especially the starter ground. other than that tighten all your sensors connections with a pair of needle nose pliers to get reeeaallly tight contacts and put a dab of dielectric grease on them too. also try jumping the car if you haven't yet, even though your battery is charged it never hurts to rule out if it may be a bad battery or if your terminals are in any way not allowing power to go through them.


Return to “240SX Technical Forum”