C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

84 issues after warm up

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Old Jan 11, 2025 | 06:03 PM
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Default 84 issues after warm up

My boys have an 84 as a project.
we got it running and now when it warms up the car will miss fire, stall and or lose power, wont get over 2k rpm. Will always restart with a little throttle.

parts we have replaced so far...
fuel pump
Fuel filter
Ignition control mod
Checkd and set the TPS
Injectors
Fuel pressure regulator
Coolent temp sensor
Map sensor
Plugs and wires
Egr valve

Not sure what to look at next... since it only is an isse after the engine warms up im kinda at a loss..

Any ideas or experiences with a similar issue on an 84 or 82 crossfire??

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Old Jan 11, 2025 | 07:32 PM
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Wonder if it's related to the CCV purge
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Old Jan 12, 2025 | 12:47 PM
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Plugged up cat converter.
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Old Jan 12, 2025 | 01:23 PM
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firing order..
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Old Jan 12, 2025 | 01:46 PM
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You could also check that the PROM is correctly connected to the ECM... I've had similar problems with a PROM connected halfway.
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Old Jan 12, 2025 | 03:08 PM
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Originally Posted by ex-x-fire
Plugged up cat converter.

the culprit id rule out as well.

Oil temps should be sky high, and rpms restricted.

If you use a laser temp gun, you shouldn’t have a massive delta btwn before and after the cat. if you do, exhaust is restricted by the car.

cheapest and quickest way is to carefully remove rear Y, (rusted bolts high propensity of snapping) piece of rebar or similar, mini 2lbs hammer, smash up the plugged honey comb. Suck it out with a shop vac. ductape a piece of smaller hose if you cant get it in.

wear a facemask. if this fixes the issue then u can either run it or replace with a cat.
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Old Jan 12, 2025 | 05:16 PM
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Originally Posted by ex-x-fire
Plugged up cat converter.
do you think that would only be an issue or get worse after warm up??
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Old Jan 13, 2025 | 06:51 AM
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Adding heat can change/expand things. You need to do some testing.
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