||11-28-2012 07:00 PM
Timing jumped during hard braking?
89 3VZE. Today I had to brake fairly hard for a stop light, and once I left the light the truck started chugging and hesitating and had little power. I had to limp it home, which it would get to highway speed if you wanted it to but took a while, and it has a scratching/squeeling noise every now and then when on the gas, almost like a bad bearing noise.
It idles, it runs, it drives, but with a erratic chug and lope. If you're steady on the throttle it will chug and lope a little but will stay fairly smooth, if you are on the throttle it will chug and lope quite a bit. At home I checked the timing and its way off. The pulley mark is a good inch and a half off of the timing plate. Basically its midways between the fan pulley and the bolt right next to the timing plate. I tried cracking the dissy and turning it to get it back to spec but it wont adjust far enough. I honestly dont know how it runs and idles with it that far off. The mark also bumps a little when the engine chugs.
I checked vacuum lines and didnt find any blown off or leaking. I checked the dissy cap and there are no broken posts, but they are pretty white. I haven't pulled the plugs yet. The only thing I did right before it went crazy on me is I turned the idle up slightly. The idle adj screw was all the way in and I had a low idle. It drove fine for a good 10 miles before this problem happened. Otherwise it usually runs good and strong with your typical 230k noises.
Any ideas? I'm cracking the timing cover off tomorrow to check the belt as I'm sure its needing replacing, and to check the cams to see if they jumped.