TBI rebuild

[tsr2185]

What would happen if it is plugged

That screen is for bleeding trapped air and balancing pressure in the injector. It gets its fuel mainly through the bottom screen. Unless it's totally plugged, no it won't cause much if any issues. It's just there to keep the inside of the injector clean.

What would happen if it was plugged ?

 

[PlayingWithTBI]

What would happen if it was plugged ?

You'd probably get some air injected in the stream or your fuel pressure at the tip of the injector may fluctuate - just a guess here.

 

[tsr2185]

FINALLY may have sourced my problem...

Got the timing light out when it is hot and checked the flashes on all the cylinders. All seemed legit and at the right frequency with the engine rpm. EXCEPT for cylinder 4. The light was about twice as fast and sort of irratic. I unplugged that plug wire from the spark plug and no change. No more cough just straight missing.

The miss aand rough idle was prevalent as soon as I got the truck running with the new dizzy. I've changed everything under the hood including rebuilding the spectra dizzy with ac delco parts and new ac delco plug wires. Am I right to assume that the distributor was bad from the very beginning?

Thoughts? Path forward? I already spoke with oreiley a month ago and they said I do have the lifetime warranty on it. And can exchange it for a new one...

 

[Schurkey]

Move (exchange) #4 plug wire to a different cylinder. See if the misfire/cough follows the plug wire, or stays on #4.

 

[tsr2185]

Move (exchange) #4 plug wire to a different cylinder. See if the misfire/cough follows the plug wire, or stays on #4.

New dizzy didn't fix it of course. Swapped cyl 4 and cyl 3 wires and plugs and stays on the same bank.

Can intake gasket cause missfire on a cylinder WITHOUT consuming coolant AND good compression?

 

[Schurkey]

Can intake gasket cause missfire on a cylinder WITHOUT consuming coolant AND good compression?

Absolutely. Happened to me, because I stupidly selected an intake gasket set that had too-large port openings for my intake manifold. Sealed just fine...for a few months. Then the gasket squeezed out-of-position allowing an air leak into #1 and #3.

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[tsr2185]

Absolutely. Happened to me, because I stupidly selected an intake gasket set that had too-large port openings for my intake manifold. Sealed just fine...for a few months. Then the gasket squeezed out-of-position allowing an air leak into #1 and #3.

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Where your symptoms similar to this? Only noticeable at idle?

BTW u slacking, u didn't copyright that image.

What intake gasket kit would you recommend from rock auto? I may aswell go ahead and change out intake manifold gaskets and clean manifold and inspect. I wouldn't mind doing it at all, just gotta find the time..

 

[Schurkey]

Where your symptoms similar to this? Only noticeable at idle?

Rough idle, ran poor off-idle. Less noticeable as RPM/throttle opening increased.

BTW u slacking, u didn't copyright that image.

Fixed. Thanks for noticing. Now marked as "copyrighted".

What intake gasket kit would you recommend from rock auto? I may aswell go ahead and change out intake manifold gaskets and clean manifold and inspect. I wouldn't mind doing it at all, just gotta find the time..

TBI intake manifold requires a "special" gasket. Be sure to use a TBI intake gasket set. If you're not using a TBI intake, (no coolant passage from thermostat area to right-rear corner of manifold) you have additional choices. My non-TBI heads and manifold needed a Fel-Pro 1256.

The actual TBI gaskets are these, or equivalents from other manufacturers.
www.summitracing.com/parts/fel-ms93317

Fel-Pro MS 93317 Fel-Pro Intake Manifold Gaskets | Summit Racing

Free Shipping - Fel-Pro Intake Manifold Gaskets with qualifying orders of $109. Shop Intake Manifold Gaskets at Summit Racing.

www.summitracing.com

You must be registered for see images attach

 

[tsr2185]

Rough idle, ran poor off-idle. Less noticeable as RPM/throttle opening increased.


Fixed. Thanks for noticing.


TBI intake manifold requires a "special" gasket. Be sure to use a TBI intake gasket set. If you're not using a TBI intake, (no coolant passage from thermostat area to right-rear corner of manifold) you have additional choices. My non-TBI heads and manifold needed a Fel-Pro 1256

You must be registered for see images attach

Thanks man. That'll be for sure my next lump of money I dump into this truck. Got new front brakes and rotors coming in tomorrow due to my warped passenger front rotor that shakes the whole truck when braking. Who knows, maybe the brakes cause my intake gasket to give lol.

Thanks....

 

[1993GMCC2500SLX]

Alot of you guys mention the esc module the 87 p30 intake had one bolted to it, but I have been allover the wiring harness for the 94 I cannot find a plug for one anywhere?! And I just was messing with it again battery is dead cold weather, anyways I thought to check the tbi and I can move the throttle shaft out just off the idle position enough that it sounds like smacking two extensions together,is that too worn throttle shaft bushings to use, because if that's the case then after I test the fuel pressure I'm thinking I just need to get rid of whatever this tbi is and replace it with a good one off a running truck..