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4G15 GDI Mysterious Problem

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Sampson10
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4G15 GDI Mysterious Problem

Postby Sampson10 » June 3rd, 2016, 10:13 pm

I have a Mitsubishi lancer (2002 model) with a 4G15 (CVT) GDI engine. Lately I have been experiencing some problems that seems very difficult to identify. When AC is off car works perfectly, but when AC is on car stutters, loses power and cuts off when stopped or slowed down. Checked coil packs, changed spark plugs, serviced throttle body, serviced air intake sensor etc. Still experienced same problems so mechanic said to check AC. Took car to AC guy, was told that AC is in perfect working condition. Then took it to an electrician who told me that the alternator was charging fine to take it back to mechanic. Does anyone know what the heck is wrong with this car?

trini iceman
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Re: 4G15 GDI Mysterious Problem

Postby trini iceman » June 3rd, 2016, 11:36 pm

If it is stalling can you keep it running by stepping on the gas? Is it difficult to restart? What happens if you just put on the blower?

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racedriverpro
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Re: 4G15 GDI Mysterious Problem

Postby racedriverpro » June 4th, 2016, 8:26 am

Idle air control valve or idle step up unit...

VLDS
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Re: 4G15 GDI Mysterious Problem

Postby VLDS » June 5th, 2016, 1:50 am

I went through the very similar problems with a 4g94 GDI. Turned out to be the GDI fuel pump after months of trial and error.

nissan4life
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Re: 4G15 GDI Mysterious Problem

Postby nissan4life » June 8th, 2016, 11:34 am

GDI doesnt carry a iacv as this is controlled by the ecu nor is it the fuel pump as the car would not be idling on at a stop.

Sampson i experienced this recently, when the ac is on the car is under added load. My idle use to drop extremely low especially at a stop and cut off with ac on.
One of the poor designs in gdi technology is the carbon build up caused by the exhaust gas re circulation.

Contact ryotech on the forum, he ran two services on my car, a intake manifold cleaning and a injector cleaner.
GDI injectors are built into the combustion chamber so the typical injector cleaner wont work as it would on a normal port fuel injector that sits on a rail.There is a product he used called BG44k gdi injector cleaner
This is a in tank solution and the intake solution he used was done through a machine. My car has been working great after the service, i suggest you give him a call.

Only distributor i have seen carrying the BG products locally is AUSCO, but i sure there are others.

tdaisley
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Joined: September 12th, 2011, 10:48 am

Re: 4G15 GDI Mysterious Problem

Postby tdaisley » July 1st, 2016, 9:41 pm

Was experiencing same problem no one knew what was going on check throttle cable there's two ten bolts adjust and make sure cable is tense not to pull butterfly make sure cable has no play

leo0816
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Re: 4G15 GDI Mysterious Problem

Postby leo0816 » August 30th, 2019, 6:50 pm

Good day Gentlemen, I'm having this same problem with my lancer and I believe is what nissan4Life is commenting about. Does anyone have any contact information for ROYTECH? I'm unable to look at his information.

Sjnerro
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Joined: September 18th, 2019, 1:35 am

Re: 4G15 GDI Mysterious Problem

Postby Sjnerro » September 18th, 2019, 1:42 am

I have a 2001 lancer Cedia, ok so when I start it it revs high then after a while it tones down but when u leave it an watch it then it goes lower and lower till it shuts off, I have to drive with two foot one one has an one on brake, it just don’t throttle on its own, installed back the ac and it even worst, omg can someone just help me and tell me what’s going on cause here in Jamaica they just telling me to throw the engine away an I love my car there must be a way to fix this issue, please help me or contact me via WhatsApp with info on how to get it fixed at 8764842959 I beg of this assistance

kmarchan9
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Re: 4G15 GDI Mysterious Problem

Postby kmarchan9 » March 17th, 2021, 12:59 pm

I have a gdi 4g15. It's idling low I got it scan they said
It's the throttle body. I change it & getting the same
thing. Can anybody tell me how this problem could be solve.

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ZeroOne
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Re: 4G15 GDI Mysterious Problem

Postby ZeroOne » March 29th, 2021, 8:49 pm

Might need to to another engine scan for error codes and perhaps a compression test.

Is the engine cutting off?

kmarchan9
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Re: 4G15 GDI Mysterious Problem

Postby kmarchan9 » April 9th, 2021, 8:19 am

No it isn't

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ZeroOne
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Re: 4G15 GDI Mysterious Problem

Postby ZeroOne » April 11th, 2021, 8:29 pm

Ok check your high fuel pressure supposed to be 5, also check your fuel trims

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