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Unread 08-08-2009   #1 (permalink)
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Default hesitation in response when the gas pedal is pressed

I have a 1987 mustang, whenever i press the pedal from idle it hesitates, about 1-2 seconds, is this normal?
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Unread 08-08-2009   #2 (permalink)
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when was the last time you did a tune up? have you ever cleaned the t/b? I would also pull the codes
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Unread 08-08-2009   #3 (permalink)
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never, my car has been sitting for 2 yrs before i bought it, i put a radiator, water pump, thermostat, and my brother had the engine rebuilt before he put it away.
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Unread 08-10-2009   #4 (permalink)
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did you put fresh gas in the car?
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Unread 08-10-2009   #5 (permalink)
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Check your timing and make sure you're at least running at 10* BTDC. I would go ahead and advance the timing to 12*.

The fuel thing could also be an issue. If you're running off of 2 year old gasoline, I give you a BIG . I've seen what gas can do even after just sitting for a few months. Not pretty...

Change the fuel filter, and hopefully the fuel pump is OK...
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Unread 08-24-2009   #6 (permalink)
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no, ive only ran it a few times, but i plan on diluting it with some premium, is it ok if i leave the old gas in it?
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Unread 08-24-2009   #7 (permalink)
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It would be best if you didn't also make sure you have fresh plugs and that they are gaped correctly this fixed the same issue for my 90 GT good luck
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Unread 08-24-2009   #8 (permalink)
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Definetly need to syphon the old crap out and fill w/ good premium or reg. If your going to advance your timing to 12* then use premium otherwise no need but check your timing to be @ 10*btdc. You will need to do a complete tune-up: Plugs, wires, cap, rotor, oil, filters, etc. Get a can of starting fluid a spray aroumd your intake while idling to check for a bad gasket or hose.
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Unread 08-25-2009   #9 (permalink)
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thanks guys, this really helped.
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Unread 08-25-2009   #10 (permalink)
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Most of the guys in here more than likely got it right when they are saying its bad gas or it just needs a nice tune up. If you already ran the gas might as well run it all out and then tune it up and change everything. Trying to syphon it out you are not going to get everything. No two mustangs are alike in throttle response. I have has some better than others. Most people overlook tps.
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Unread 08-25-2009   #11 (permalink)
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tps? whats that?
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Unread 08-25-2009   #12 (permalink)
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Throttle position sensor its located right on top of the throttle body it needs to be calibrated to I can't remember the voltage but is pretty specific. Thats a good point.
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Unread 08-26-2009   #13 (permalink)
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green to black should read .98v or as close as possible (loosen screws to adj then carefully retighten while holding in place) but thats probably not going to give it hesitation.
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Unread 08-26-2009   #14 (permalink)
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Quote:
Originally Posted by spdjnky_42 View Post
green to black should read .98v or as close as possible (loosen screws to adj then carefully retighten while holding in place) but thats probably not going to give it hesitation.
i AGREE i recalibrated my TPS a couple of weeks ago and i could tell a difference as soon as i started my car. the have been several threads about this subject-i would search the site so you can make sure you are doing it correctly. the car has to be off, the key has to be in the "on position" (when calbirating your voltage). then you need to start your car and recheck your idle screw on your TB. my car(5.0/5speed) is set at a 750RPM for idle, yours will vary based on year and transmission.
to add to the fuel thing, after syphoning out the old junk-add 1/2 a can of Sea-Foam to your tank and run it-you can pick it up at any auto parts store for around $8. good luck!!
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Unread 08-26-2009   #15 (permalink)
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TPS out of range can result in a Hesistation. The ECM uses the TPS, MAF to determine what type of load condition is on the engine, then uses spark and Fuel as neccessary

Not saying it his Problem, but it can happen.

Change Gas, change Plugs and wires, cap and rotor.

Run the Diagnostic codes. Doesnt matter if the Check Engine Light is on or not.
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