Need some help on this one. I have a 1988 isuzu trooper with the 2.6 fuel injected. It has been having a few probs. lately. It is seriousy lacking any power and as soon and you bring the rpm up over 2k it starts backfiring through the intake. I checked my fuel pressure, its right where it needs to be, then I went onto timing, it was sitting at about 15 degrees adv. I went ahead and adjusted the timing to about 12 degrees, then shut her down and tighted the bolt. I brought the rpm up a few times and check it again, timing was still at 12. I then noted that when I brought the rpm up the timing was not advancing. I assumed it was the sensor in the dist. and bought a new one. Installed today, no change! I checked the timing marks and its good, timing belt has maybe 10k on it.

 

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Ok, time to revive this thread, over a year has passed and still haven't gotten this thing fixed. I could really use some ideas while I still have some hair left on my head! Let me know what you guys think.

 

I'd be more than happy to help you get the problem sorted out. The first thing you need to be aware of is that the harmonic balancers on the 2.6 motors are EXTREMELY prone to slipping the outer ring and causing the timing mark to be incorrect. You can not trust a harmonic balancer on a 2.6 for ignition timing. There's a simple and fool proof procedure for timing a 2.6, you should check your valve timing at the same time, just to ensure that everything is Kosher. Pull the upper timing cover and get the cam gear so that the arrow is lining up with the TDC mark on the aluminum backing plate. I would remove the #1 spark plug at this point and feel into the cylinder with something long and skinny and rock the motor back and forth a little and verify that the bottom end is also at TDC. When the bottom end is at TDC and the cam timing marks are aligned, you now need to set the distributo to the #4 cylinder. This is contrary to every other motor I've ever worked on or known about and this is something that has defeated a lot of people, simply because they were assuming that they should be firing on #1. Anyway, from here you remove the distributor cap and align the distributor so that the rotor is pointed at the hold down stud. This should put the rotor at a 10:30 position if viewing like a clock. The distributor housing should be clamped down in the center of the adjustment slot so that the nut is aligned with the midway mark. The engine will fire and run in this position and then fine tune timing should be done by advancing the timing until the engine starts to ping and then retard until it stops and the engines run strong and smooth. I have a lot of technical information, videos, etc on my facebook page and my youtube channel http://www.facebook.com/pages/Johnny...36753906457980
http://www.youtube.com/user/Johnnhy5ive/videos

 

Thanks for the reply! First in over a year! I will double check and do as you suggested. What has me confused is why the timing never advances when I rev up the engine. I have replaced the distributor assembly, ecm, tps, and other misc. Sensors on the engine but it has never advaced. I won't be able to check on the timing until tuesday, I will let you know what happens!

 

I agree what you were told to do. Also wanted to let you know that it might have jumped time if the belt was not properly set when first done. And now 10,000 miles later the belt will have stretched and could have jumped a few teeth. Not saying that is your problem. Also I am pretty sure the advance is controled by the ECM. Been a long time since playing with one this old. If necessary I will hunt down my service manual for I have not needed it for many years.