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Date Registered: 06-2016
Location: Guildford
TOTAL POSTS: 12
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Strange bogging down on Startup


Hi,
We've noticed a strange issue that our Exy (T30 Series 1) is having and am hoping someone might know how to go about fixing it/finding the problem.
When the car starts up and we drive it without letting it warm up, it bogs down a lot when I change gear.

I think it occurs when I accelerate, release (the accelerator and any engine load, i.e. clutch in) and then get back on the accelerator (about 1 second after I get back on the throttle, it bogs). Its quite significant and seems to be the same drop in performance regardless of RPM.
Although at low RPM/throttle position it goes from accelerating to decelerating and at high RPM/throttle position it goes from a rapid acceleration to a slow acceleration.

It goes away after the car warms up but it does do this on warm startups occasionally.
On a side note, we have the full Hi-Tech exhaust - Extractors, high-flow cat and cat back

It seems to be an electronic thing, either a sensor giving false information or the ECU itself trying to maintain "safe" operating conditions. I've dug around the Workshop manual and couldn't find much other than the following:

At startup, the ECU runs the car rich - injecting fuel twice in each cylinder per engine cycle
The MAF sensor influences the fuel input
The O2 sensor in the Hi-Tech extractors influences the fuel input

My initial thoughts were that it might be fuel delivery related, that it might be build-up around the O2 sensor in the exhaust giving false information or the ECU having "learnt" something in order to keep the engine "Safe".

That's all I can think of and I can try to film it because it does do it consistently on cold start-ups if that helps. Apologies for the essay...

Cheers, Adrian

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Adrian, Guildford NSW
Black 2002 T30 Series 1 Ti
Member No. X-4675
2/Mar/2018, 12:49 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5250
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Re: Strange bogging down on Startup


Being an 02 T30 I'm assuming it has done a few kms. Has the O2 sensor been changed or the MAF cleaned ?

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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Date Registered: 06-2016
Location: Guildford
TOTAL POSTS: 12
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Re: Strange bogging down on Startup


I don't think either of them have been done, its done 209,000km but its had a pampered life with full service history. They may have been done when we did the big exhaust/head gasket work (around 185,000km) but I can't be sure.
The mechanics record listed a "throttle body reset" but it doesn't list anything about an O2 sensor

But I think I'll need to pause the investigation as I've had a car accident this afternoon and it's not drive able. I hit the front left corner pretty bad.

Fingers crossed it's not a write-off because the car means more than gold for us (even though the insurance values it at $3,700)

If people have any ideas, I'll still check the forums but there's no real urgency

Cheers, Adrian

---
Adrian, Guildford NSW
Black 2002 T30 Series 1 Ti
Member No. X-4675
2/Mar/2018, 8:27 pm Link to this post Send Email PM   Send Private Message Blog
 


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