A couple of 3s-gte questions - MR2 Owners Club Message Board
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post #1 of 6 (permalink) Old May 29th, 2019, 09:36 Thread Starter
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A couple of 3s-gte questions

This is my Mk1.5 with a 5th gen s3-gte, turbosmart blowoff valve, Geddy profec EBC,
stock intercooler, 2.5Ē KO downpipe, running about 8psi.

I hadnít noticed any problems until I got on the highway and drove at 70mph steadily.
After about 20min, the engine stuttered strongly, I lifted the throttle and the stutter went away.
every 10 min after that the same thing would happen. If I didnít lift, the stutter would continue and the car would lose power and slow down. As soon as I released the throttle everything was fine. If I proactively lifted from time to time, the stutter did not happen. If I was in traffic and had to vary my speed significantly, the stutter would not appear.

Has anyone run into this sort of thing before?

Question #2
Is there any way to adjust the A/F a bit leaner at full throttle with the stock ECU?
While Iím not getting any drivability problems at the moment, itís pretty inefficient. My 10gal tank goes fast when I doÖ Iím hitting 9 to 1 at or near WOT.
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post #2 of 6 (permalink) Old August 20th, 2019, 16:49
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did you ever find out the problem? did you clean your injectors?
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post #3 of 6 (permalink) Old August 20th, 2019, 22:34
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Is it possible your intake temps are too high? Engine bay getting heat soaked? I noticed the stock inter-cooler, yet upgraded exhaust. Do you have heat shields on the manifold, guarding the intake piping?

I'm by no means an expert and haven't had this issue, but I know this is a common problem with mid-engine cars.
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post #4 of 6 (permalink) Old August 21st, 2019, 13:42 Thread Starter
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I still have the problem; I haven't cleaned the injectors.
It only happens on the highway at constant speeds, so I don't run into it very often. Normal driving and track days do not elicit the issue.
I do have a great deal of shielding and insulation in various places and some of the original metal shielding.
The fuel line is routed in the coolest area of the engine bay (although the line from the gas tank is near the exhaust - under about 3 layers of shielding)
I'm guessing there is a vacuum or boost line connected sub-optimally? The stutter and hesitation is immediately stopped by releasing the throttle for a moment.

thanks for the ideas!
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post #5 of 6 (permalink) Old August 21st, 2019, 18:56
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Are you running 2 x o2 sensors? (Wide & narrow) What is your AFR at the time of the issue? (Is it running too lean suddenly)

I have an issue with my PLX wideband oxy sensor. It has an output for narrowband. But if I connect this narrowband output for the ECU, after time it leans the mixture which it shouldn't do. Obviously something is slightly off, so I still use the standard narrow band o2 for the ECU and wideband for logging only.
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post #6 of 6 (permalink) Old August 22nd, 2019, 15:11 Thread Starter
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Yeah - about those O2 sensors :-p
I have the OEM narrowband connected to the harness and ECU, and a separate Innovate MXL wideband gauge. The MXL worked for about a year, then started to complain with an E08 - bad sensor.
I replaced the sensor and now have an E04 - bad connection. There's only one plug, and it's squeaky clean. Sheesh.
So at the moment, I don't know what's happening A/Fwise. I should just replace the wideband I guess - it's such a pain to get to!
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