New here, 99 Yukon strange issue

[ASHTEK]

So I've been searching through these forums for a week or so, and I haven't seen this particular issue. So here is some background info. 1999 Yukon slt, 200k on motor and 80k on trans. Maintained moderately well (new cap, rotor, wires, coil, plugs, air filter, fuel filter). So truck was running great according to my friend, whom I bought this truck from ($545). Guy was driving along one day, engine had a massive backfire through the intake. Truck immediately shut off, will still start for a split second and shut off again. Upon inspection the upper intake/plenum has shattered into 4 pieces. She sat this way for a week before I bought it. After getting the truck home, I pull the plenum and find significant carbon/gunk build up. Ordered the mfpi kit, new plenum and seals. So this post is kinda a have any of you guys seen that before and a does it seem like the parts I ordered will fix this truck (BTW the fuel pump still works, but system would not hold pressure with the old spider). Some info about me, Ford guy my whole life built and rebuilt several motors and trans, built a few drag motors, anyway two kids, a 98 expedition, and a 99 f150 later I am tired of working on motors under the firewall. Started looking for a full size suv, preferably with a v8 not under the dash, so I wind up with this Yukon.

 

[2000tahoeZ71]

It sounds like the spider and/or fuel pressure regulator was leaking fuel and lead to that backfire. I would go ahead and pull the lower intake and replace the gaskets if you don't know if they have been done. Felpro makes the best gasket kit. Order new bolts too. There are several threads about it here. Get a good inch pound torque wrench too.

 

[ASHTEK]

Thanks for the tip on the lower gaskets, forgot about those. Is the plenum breaking a fairly common issue? I've helped a couple friends replace their fuel spiders that were causing intake backfires, just never seen one shatter like that.

 

[SunlitComet]

No, exploding plenums are not normal. Must have dumped a lot f fuel to vaporize and blow it up.

 

[bestkid12]

I have a 2000 Tahoe with a starting issue which I think it has something to do with the starter wen going to crack it makes a loud whining sound don't start or turn over

 

[SunlitComet]

The plunger fork or drive pinion might be broke. It would need to be removed to visually inspect it. If it does it randomly then the fork part is likely ok.