My 93 Ty is fairly original and un-dorked with. Other than the 2nd Gen brake upgrade a couple of years ago, I only work on it when something needs fixing. The engine is original and other than valve stem seals 15 years ago, it hasn't needed anything other than maintaince.
It has had a pretty hard miss at idle for several months, but seemed to run fine off-idle. A few weeks ago when I did the motor mounts I checked the compression (160-170 on all), found and replaced 2 bad wires, and was surprised that it still idled like azz. Yesterday I decided to check the injector balance with my self-developed method (nope), looked at the spray pattern through the ports (nope), and ohmed the coils (nope, all good). So not the injectors, either.
And then I saw a shiny spot above the #2-#4 intake port alongside the head. The gasket had blown out. We found the same thing on Paul-Z's Ty a year ago. Both trucks were originals, and have about the same mileage in service. I never would have seen this without the intercooler and possibly the throttle body as well, removed. I know guys talk about the gasket blowing into the valley, but I've never seen that. This is 2 for 2 that blew on the top side where it is "findable". Both trucks had the OEM aluminum sandwich intake gaskets.
So I renewed the gaskets (I used the Felpro 1202's), I also took the opportunity to change the pick-up coil in the distributor and the oil press sending unit as they were accessible with the upper off. I also re-did my purple wire relay setup to a cleaner deal I do now instead of the cobbled thing I did 20 years ago. Again, because the wiring on the firewall was easy to access.
So 2 easy days in my shop, and it purrs like a stock Ty through an ATR exhaust should..
Merry Christmas
Dave P
It has had a pretty hard miss at idle for several months, but seemed to run fine off-idle. A few weeks ago when I did the motor mounts I checked the compression (160-170 on all), found and replaced 2 bad wires, and was surprised that it still idled like azz. Yesterday I decided to check the injector balance with my self-developed method (nope), looked at the spray pattern through the ports (nope), and ohmed the coils (nope, all good). So not the injectors, either.
And then I saw a shiny spot above the #2-#4 intake port alongside the head. The gasket had blown out. We found the same thing on Paul-Z's Ty a year ago. Both trucks were originals, and have about the same mileage in service. I never would have seen this without the intercooler and possibly the throttle body as well, removed. I know guys talk about the gasket blowing into the valley, but I've never seen that. This is 2 for 2 that blew on the top side where it is "findable". Both trucks had the OEM aluminum sandwich intake gaskets.
So I renewed the gaskets (I used the Felpro 1202's), I also took the opportunity to change the pick-up coil in the distributor and the oil press sending unit as they were accessible with the upper off. I also re-did my purple wire relay setup to a cleaner deal I do now instead of the cobbled thing I did 20 years ago. Again, because the wiring on the firewall was easy to access.
So 2 easy days in my shop, and it purrs like a stock Ty through an ATR exhaust should..
Merry Christmas
Dave P
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