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[Mk2] [Turbo] Rev 1 Turbo choking, losing power, spluttering, stalling

 
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v1xz
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1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Fri May 26, 2017 2:54 pm    Post subject: [Mk2] [Turbo] Rev 1 Turbo choking, losing power, spluttering, stalling Reply with quote Reply with quote including images

Rev 1 Turbo drives fine for a few minutes then begins to splutter/cough/die eventually. Switch engine off, start it up again and its fine for another few minutes. No ECU codes stored. AFM unit changed for a good one. Anyone have an idea where else to look? Engine is completely standard...

Ive had this vehicle for a few days now. Started off as owner said it was hitting fuel cut. Which it wasnt, it was also not the knock sensor.

After putting it back together it ran fine and boosted until a few minutes in and it just doesn't have any power under load.

Any help?
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Al-sw20




Joined: 23 Jan 2005
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1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Fri May 26, 2017 8:26 pm    Post subject: Reply with quote Reply with quote including images

How is the turbo inlet pipe looking? They crack over time.
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v1xz
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1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Fri May 26, 2017 10:01 pm    Post subject: Reply with quote Reply with quote including images

I believe it is a new silicone pipe which was installed by last owner.
Does this pipe need to be air tight?
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Al-sw20




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1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Sat May 27, 2017 12:12 am    Post subject: Reply with quote Reply with quote including images

You don't want to have any possible leaks otherwise the turbocharger will compress unmetered air which may cause rough running.
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v1xz
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1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Fri Jun 02, 2017 9:18 am    Post subject: Reply with quote Reply with quote including images

Thanks for this but it seems like it didnt last.

The intake pipe was ripped so i patched it up so it was tight. Drove as it would but then on certain occasions it would cough, splutter, no power. But it did seem to stay alive abit longer then it was [Dancing] [Dancing]
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v1xz
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1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Wed Jun 07, 2017 6:05 pm    Post subject: Reply with quote Reply with quote including images

Anyone else had this problem?
Getting error codes 24 & 31...
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mr2magic




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1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Thu Jun 08, 2017 11:16 am    Post subject: Reply with quote Reply with quote including images

Has someone tampered with the map sensor and hand wired in an FCD/Diode?

24 is the IAT Sensor in the MAF (open circuit or short)
31 is the MAP Sensor (open circuit or short)
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v1xz
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1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Thu Jun 08, 2017 12:28 pm    Post subject: Reply with quote Reply with quote including images

The AFM box has been changed for a good unit.
Only thing I have done is install a boost gauge, 't' piece into pipe from map sensor.
No FCD or diode installed.
Would 24 no indicate the sensor inside throttle body?
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mr2magic




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1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Thu Jun 08, 2017 3:27 pm    Post subject: Reply with quote Reply with quote including images

The 3sgte has no temp sensor in the throttle body afaik.
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v1xz
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1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Tue Jul 04, 2017 8:00 pm    Post subject: Reply with quote Reply with quote including images

This problem still presists...
I managed to clear all codes and they didnt return
I then managed to get code 22 and 42, which cleared also and havent returned.

Ive replaced the ecu with another and no change.

Im coming to end of my tether here.
I have noticed the vehicle is warming up really really quick, could it be that its running lean? Fuel pump on way out and not providing enough pressure on boost when warm?
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pbmr2
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PostPosted: Thu Jul 06, 2017 3:11 pm    Post subject: Reply with quote Reply with quote including images

you could swap the IAT sensor for the one on the engine lid. they are the same sensor. just to rule that out as faulty.

have you tested the temp sensor to make sure it's not at fault?
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v1xz
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1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Thu Jul 06, 2017 4:45 pm    Post subject: Reply with quote Reply with quote including images

Coolant temp sensor? If so, yes a new one has been installed by myself
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