89 Throttle Response

Slo5Oh89 · Sep 19, 2014

I have a pretty stock 89. I have noticed when I let off the gas there is a 1-2 second delay till the engine starts to reduce rpm. So I am starting to think it might be reducing my response with acceleration!

I have zero idle issues. TPS Sesnor?

I do have a MSD 6A box and coil.

This just seems odd to me. Seems to of developed over the last few months.

Any ideas?

Lscam580 · Sep 19, 2014

Check your iac and then check voltage on tps .94-.97 volts

Slo5Oh89 · Sep 19, 2014

I have had iac issues before but how am I to check it for this? I will check the tips never have before. Any other ideas?

Micheal Nadeau · Sep 19, 2014

Is the car a manual or automatic? Have you checked to make sure the throttle blade isn't sticking or the cable is hanging up?

Slo5Oh89 · Sep 19, 2014

Micheal Nadeau said:
Is the car a manual or automatic? Have you checked to make sure the throttle blade isn't sticking or the cable is hanging up?

Manual

Micheal Nadeau · Sep 19, 2014

Slowing down in gear or nuetral?

jrichker · Sep 19, 2014

All the EFI fox 5.0 Mustangs have a built in dashpot feature in the computer. When you let off the gas to slow down, the computer adds a small amount of air via the IAB to prevent stalling when you come to a stop.

Mustang5L5 · Sep 22, 2014

Run the codes. If there isn't a code...don't worry about it

89 Throttle Response

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