Power loss when engine warms up

1990TalonFast · Feb 24, 2010

When I start my car in the morning or when I let it sit and cool o hour or so, it runs like a champion, pulls my neck back and the way it takes my breath away like no other, as soon as it warms up, the seems to loose its neck snapping power, it still pulls but not in a mustang eliminator way, its more of a nice grocery getter way, the turbo s fine, I feel boost and their are no boost leaks, new ngk bpr6es, I feel boost and their are no boost leaks, new ngk bpr6es pl ngk wires, new distributer and no exhaust leaks or boost leaks and ngk wires, new distributer and no exhaust leaks or boost leaks a that already, what can cause a huge power loss just because the heat increase? I am stumped...

gofast63 · Oct 26, 2014

I think you still have a leak somewhere

420a DSM · Oct 26, 2014

Use some bpc or carb cleaner and spray your piping find your leak.. check vac lines too there arent that many

TalonFULLtune · Oct 26, 2014

check o2s

420a DSM · Oct 26, 2014

Any cel?

Eddie Tsi · Oct 26, 2014

420a DSM said:
Any cel?

1990TalonFast said:
When I start my car in the morning or when I let it sit and cool o hour or so, it runs like a champion, pulls my neck back and the way it takes my breath away like no other, as soon as it warms up, the seems to loose its neck snapping power, it still pulls but not in a mustang eliminator way, its more of a nice grocery getter way, the turbo s fine, I feel boost and their are no boost leaks, new ngk bpr6es, I feel boost and their are no boost leaks, new ngk bpr6es pl ngk wires, new distributer and no exhaust leaks or boost leaks and ngk wires, new distributer and no exhaust leaks or boost leaks a that already, what can cause a huge power loss just because the heat increase? I am stumped...

Maybe a long shot, but try a colder range plug Ngk bpr7es.

Size9Zombie · Oct 27, 2014

Is this something tht has benn progressivly gettin worse over time or has this lack of power once warm something tht started all at once? Have u checked compression yet?

DSM1G90 · Oct 28, 2014

4G63's have no distributor.

Cold motor has thicker oil meaning higher compression.

Oil thins when getting hot and loss of power can mean tired or worn compression rings.

Do a compression check to make sure.

ChrisSoFresh · Oct 28, 2014

I would check injectors, when my car was cold it ran perfect and when it got hot I would lose power from defective injector. Once the injector got hot it would stop working for some reason, I got used injectors and haven't had issues since

DSM1G90 · Nov 1, 2014

Did that also, but in a worse form when one injector would just plain open up when things got up to operating temp.

Replace all four and problem solved in getting a smooth motor back.

Chaoticdopey · Nov 1, 2014

gofast63 said:
I think you still have a leak somewhere

gofast63 · Nov 1, 2014

Chaoticdopey said:

The reason I typed that is because I could have sworn he typed it bucks while under boost...I must have read another thread and posted on this one... LOL

sorry

I had this same problem a while back. I just did a deep cleaning on my fuel injectors and it solved my problem. I just took a AA battery with alligator clips on each pin on the fuel injector. Made a button out of one of the wires. Connected a piece of hose on the fuel injector and a air line connector on the other end. Spray carb cleaner in the hose and connect an air line with 40psi going to it. Then press your make shift button and see how it sprays.[DOUBLEPOST=1414885057][/DOUBLEPOST] :confused:

I just notice this thread is from 2010!!!!

DSM1G90 · Nov 2, 2014

Ya, slipped away from a lot of us, but at least the info given on this thread does hold merit for needed help for someone in the future.

tuurbo junkiiiee · Nov 23, 2014

Have you visually inspected the turbo? or manifold? When the metal heats up it stretches causing it to open a crack that may be sealed at cold temperatures. I would try a boost leak test at operating temperature

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Power loss when engine warms up

1990TalonFast

gofast63

420a DSM

TalonFULLtune

420a DSM

Eddie Tsi

Size9Zombie

DSM1G90

ChrisSoFresh

DSM1G90

Chaoticdopey

gofast63

DSM1G90

tuurbo junkiiiee

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