Technical Tips > Post 84
1986 C4 MAF Sensor replacement?
Ausrs:
--- Quote from: peterw on February 22, 2020, 10:51:25 PM ---
--- Quote from: Vettech on February 22, 2020, 08:36:12 PM ---
These TPI V8's have a 9th injector, "COLD START INJECTOR" controlled independantly when certain criteria met (# starts, time, temp)
But at first start from cold should run for up to 8 sec.
--- End quote ---
I will definitely check the CS injector, that sounds a real possibility.
Pete
--- End quote ---
Have you ever considered getting a different tune on your prom ? I had an updated tune with a cold start circuit in it put on a chip from the USA by a guy that works on TPI for a living,I still have the 9th injector but nothing is attached to it ( plus I have no vats,no egr and a few other bits changed,It just uncomplicates the car somewhat ) )
peterw:
--- Quote from: Ausrs on February 23, 2020, 02:55:16 PM ---Have you ever considered getting a different tune on your prom ? I had an updated tune with a cold start circuit in it put on a chip from the USA by a guy that works on TPI for a living,I still have the 9th injector but nothing is attached to it ( plus I have no vats,no egr and a few other bits changed,It just uncomplicates the car somewhat ) )
--- End quote ---
Playing a tune on my prong?
Seriously, can the ECU be reprogrammed?
That would surprise me as 1984 is early days of computerised engine management.
I am a carbie and points guy so I am learning this as I go.
The car is bog standard and I not keen to modify it (unless I have to or unless I get a big benefit from it). I realise the science of engine management would have come a long way since 84 so am open to it.
This would get me out of my depth so I would need to find someone to tune and maintain the system.
Pete
Ausrs:
The answer to your question is yes it is old and yes it can be tuned, well the removable proms(chip can be reprogrammed )
Mine is only a couple of years newer than yours and I had mime all sorted out and it has not given me any problems since about 2013
the alterations I have on mine are
Fans on at 180
Trans drops in to overdrive at 60 kph instead of 80kph
Later model tune to get rid of the 9th injector
complete vats removal from the prom
Egr removed at the prom
Obviously a custom tune is out of the question as your car would have to go to the USA to be tuned, burt a new prom with tune improvements can be made in the USA and sent to you for under $200 (I am guessing as mine was )
The person I found to burn me a new tune is very well known on Thirdgen.org (a great f body site) and he has since opened up a tuning business in the USA
You can find him on Facebook as he posts on this page
T.P.I. Tuned Port Injection
His name is Brian Van Schoiack and he is very helpful,He may also be able to offer some insight into your current problem seeing as he knows the system like the back of his hand
bfit:
--- Quote from: Ausrs on February 24, 2020, 09:13:34 AM ---The answer to your question is yes it is old and yes it can be tuned, well the removable proms(chip can be reprogrammed )
Mine is only a couple of years newer than yours and I had mime all sorted out and it has not given me any problems since about 2013
the alterations I have on mine are
Fans on at 180
Trans drops in to overdrive at 60 kph instead of 80kph
Later model tune to get rid of the 9th injector
complete vats removal from the prom
Egr removed at the prom
Obviously a custom tune is out of the question as your car would have to go to the USA to be tuned, burt a new prom with tune improvements can be made in the USA and sent to you for under $200 (I am guessing as mine was )
The person I found to burn me a new tune is very well known on Thirdgen.org (a great f body site) and he has since opened up a tuning business in the USA
You can find him on Facebook as he posts on this page
T.P.I. Tuned Port Injection
His name is Brian Van Schoiack and he is very helpful,He may also be able to offer some insight into your current problem seeing as he knows the system like the back of his hand
--- End quote ---
excellent information should be a great help
Bfit
Ausrs:
https://tunedperformance.org/?fbclid=IwAR2aHYqM-ZTmywTpzgPqqq5jEs_IKKa8LbkDU2UbB-o0hBeymzx90TXbtJI
This is Brian's website If it makes life easier,I would suggest anyone that has a C4 get a recalibrated memcal from him,It is easily the best thing you will do for your car
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