rochester quadrajet

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bhm1712
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Posts: 2672
Joined: Sun May 10, 2009 4:58 pm
Membership No: 20-607
Year: 2001
Model: Trans-Am WS6
Engine: 350
Name: Ian
Location: Nottingham
Location: Nottingham
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Re: rochester quadrajet

Post by bhm1712 » Sat Apr 19, 2014 11:37 am

with the highest rev achieved the gunson then allowed me to just tweak the screws until the flame was a lovely bright blue.
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thirdgen

Re: rochester quadrajet

Post by thirdgen » Sat Apr 19, 2014 2:09 pm

i need to get one of those then i paid £2.80 plus vat each plug :-/ next time i will use ebay should have done them straight away but i did the decals :D

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bhm1712
Site Admin
Posts: 2672
Joined: Sun May 10, 2009 4:58 pm
Membership No: 20-607
Year: 2001
Model: Trans-Am WS6
Engine: 350
Name: Ian
Location: Nottingham
Location: Nottingham
Contact:

Re: rochester quadrajet

Post by bhm1712 » Sat Apr 19, 2014 8:56 pm

My procedure for doing it without the colour tune is:

Back off the idle speed screw on the throttle linkage until it's no longer touching the throttle actuator and so the throttles are closed. Then screw in the idle mixture screw on the right hand side until the engine almost stalls at idle - will run rough. Then screw out the idle mixture screw until the revs stop getting higher. This is a small rev change not hundreds of rpm. Then 1/4 turn back in. Do the same for the left hand idle mixture screw. Then set the idle speed screw to 800 ish rpm. Not too low or the oil pressure will be too low at idle
Ian Hopkinson - Membership Manager & Forum Administrator
Northern England & Midlands Rep

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User avatar
bhm1712
Site Admin
Posts: 2672
Joined: Sun May 10, 2009 4:58 pm
Membership No: 20-607
Year: 2001
Model: Trans-Am WS6
Engine: 350
Name: Ian
Location: Nottingham
Location: Nottingham
Contact:

Re: rochester quadrajet

Post by bhm1712 » Sat Apr 19, 2014 8:58 pm

Worth noting that if your engine stalls when you have backed off the idle speed screw that's usually a good indication the idle mixtures are not set right.
Ian Hopkinson - Membership Manager & Forum Administrator
Northern England & Midlands Rep

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SUPERCHARGEDGTA

Re: rochester quadrajet

Post by SUPERCHARGEDGTA » Sat Apr 19, 2014 9:03 pm

thirdgen wrote:is that technical help :naughty:
tpi rules :oldrolf:
my tpi motor used to have its moments on hot days also. so do not rule. :p
lol
never had problems with mine or davids :shrug:
just don't touch the throttle :p

thirdgen

Re: rochester quadrajet

Post by thirdgen » Sat Apr 19, 2014 10:23 pm

thanks ian i bought a color tune today it was perfect i altered it to see a change and put it back to where is was was well set up :thumb:

thirdgen

Re: rochester quadrajet

Post by thirdgen » Sat Apr 19, 2014 10:25 pm

SUPERCHARGEDGTA wrote:
thirdgen wrote:is that technical help :naughty:
tpi rules :oldrolf:
my tpi motor used to have its moments on hot days also. so do not rule. :p
lol
never had problems with mine or davids :shrug:
just don't touch the throttle :p
my gta would not start from hot unless i gave it some pedal :p

SUPERCHARGEDGTA

Re: rochester quadrajet

Post by SUPERCHARGEDGTA » Sat Apr 19, 2014 11:23 pm

throttle position sensor not set right or fuel sensor issue, or faulty temp. sensor maybe :p

still would not want to go back to carb again :hand:

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bhm1712
Site Admin
Posts: 2672
Joined: Sun May 10, 2009 4:58 pm
Membership No: 20-607
Year: 2001
Model: Trans-Am WS6
Engine: 350
Name: Ian
Location: Nottingham
Location: Nottingham
Contact:

Re: rochester quadrajet

Post by bhm1712 » Sat Apr 19, 2014 11:34 pm

I see mr Thirdgen has gone all anti thirdgen since owning a 2nd gen1 :D
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SUPERCHARGEDGTA

Re: rochester quadrajet

Post by SUPERCHARGEDGTA » Sat Apr 19, 2014 11:39 pm

he is getting old now :think:

thirdgen

Re: rochester quadrajet

Post by thirdgen » Sun Apr 20, 2014 8:59 am

i love 3rd gens i will have another one day they drive so good. i nearly ditched my tpi for a carb when it played up :D

SUPERCHARGEDGTA

Re: rochester quadrajet

Post by SUPERCHARGEDGTA » Sun Apr 20, 2014 6:26 pm

both are fine when running right, both are a pain in the ring when they play up/don't run right ;)

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bhm1712
Site Admin
Posts: 2672
Joined: Sun May 10, 2009 4:58 pm
Membership No: 20-607
Year: 2001
Model: Trans-Am WS6
Engine: 350
Name: Ian
Location: Nottingham
Location: Nottingham
Contact:

Re: rochester quadrajet

Post by bhm1712 » Sun Apr 20, 2014 7:32 pm

Mines always a pain in the ring!
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Northern England & Midlands Rep

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