4AGE Coughing and spluttering,

[Jebus]

Just got my red top TVIS 4age running. Runs fine until it gets warm and you can physically hear it click, I geuss thats the cold start turning off. After it clicks the throttle gets really unresponsive and it seems like its starving(coughing and spluttering, backfiring in the inlet) and just wants to die. Once you rev over 4500 rpm it runs perfectly fine, and runs fine when its cold too. I just swapped the throttle body for one that definately works and it made no difference.

Please help

[ee904age]

Is it smoking at all?? Sounds like its running rich. Can you check it for error codes?

[Jebus]

Nah no smoke. O2 sensor is all hooked up. Just bizzare how its so noticable. Below 4500 it is $&#$% slow and unresponsive and the second it hits 4500 it gets full smooth power and runs perfect.

[ee904age]

The engine wasnt from a crashed car by any chance was it???
I got my bluetop from a wrecked FX, and since the dizzy sticks out the front, it took a whack and bent the shaft slightly.

It took me a week to figure out why it wasnt rinning at low rpm, and then after putting a timing light on every lead, I realised it was only firing two cyls untill the spark managed to jump across the bigger gap in the dizzy at high rpm.

A new dizzy went in and Bingo.

Might pay to check it on the off chace you have the samee prob.

[TrouserFxGt]

It sounds like the tvis actuator is buggered.

Reach under the intake manifold while the cars off and get a mate to start the car. If the actuator rod moves in then its good. If it doesn't move then its stuffed.

[ee904age]

It sounds like the tvis actuator is buggered.

Reach under the intake manifold while the cars off and get a mate to start the car. If the actuator rod moves in then its good. If it doesn't move then its stuffed.

If TVIS was sticking open/closed, the car would still run ok. It wont be very pleasant to drive but it shouldnt give the symptoms hes describing.

[Jebus]

TVIS definately opens, you notice a huge change in sound and performance at 4500rpm.

Do any of the vacuum hoses on the throttle body need to be anywhere in particular for it to run properly? Weve tried them all blocked and all open but didnt really make much difference.

[ee904age]

Other than the MAP sensor and the FPR all the others can be blocked.

[ants_ae92]

I agree with trouserfxgt.

You will notice a change in sound with or without tvis connected as the fuel maps are for when the tvis kicks in at 4500 there is a much greater fuel requirement than under 4500. Ive heard others say the sound still changes at 4500 with tvis off.

Just because it sounds like it kicks in, doesnt mean it actually does work.

Did you actually check it, or did you just dismiss it as you seem so hung up that it is a throttle body problem.

My 2 cents is to actually check, if you have then sweet, try the problems the other guys have suggested.