86 mustang gt 5 speed loses power at high RPMs - Mustang Evolution

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Old 03-05-2012, 07:54 AM   #1
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86 mustang gt 5 speed loses power at high RPMs

Have an 86 mustang gt that seems to accelerate fine, but when the RPMs get past 4K it seems like it struggles. It has the sd (speed density) setup. Changed o2 sensors, iac, tps, and map sensor. Also did plugs and wires. Any suggestions?
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Old 03-05-2012, 08:32 AM   #2
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Re: 86 mustang gt 5 speed loses power at high RPMs

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Have an 86 mustang gt that seems to accelerate fine, but when the RPMs get past 4K it seems like it struggles. It has the sd (speed density) setup. Changed o2 sensors, iac, tps, and map sensor. Also did plugs and wires. Any suggestions?
Check your fuel pressure and make sure your fuel filter is good.
Also check your timing and make sure it is correctly set.
10 degrees BTDC is the stock timing setting.


If that doesn't work I'm afraid you will just have to sign it over to me.


Seriously, convert it to MAF the first chance you get.
It's the best thing I ever did to my 86 GT.
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Old 03-05-2012, 01:00 PM   #3
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Sounds like one of two things; either loss of fuel pressure as already stated or a loss of timing advance. Either one will give you the same symptoms. If its go a stock distributor and electrical system, could be where your problem is.

BTW, convert to mass air already. Give that 86 a little pepper in its juice.
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Old 03-05-2012, 06:51 PM   #4
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That has been a thought in the back of my mind lately to convert to maf. As far as fuel problem, I will get a new fuel filter and get a new fuel pump. Only owned one vehicle that had a distributer and I never had to mess with it. I tried turning the distributer on the stang and the connector hits the thermostat housing and won't go any further. Not a total nubie with cars, just never messed with a distribute. Thanks guys
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Old 03-05-2012, 07:11 PM   #5
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you need to use a timing light and see where its at.if its not timed properly and hitting the housing then it may be a tooth off.

what i would do is test the fuel pressure while its running all the way through the rpm range while parked. a new fuel filter is always a good idea and a good starting spot.but i wouldnt change thempump yet until you atleast tested pressure.
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Old 03-05-2012, 08:41 PM   #6
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This weekend I will check the timing and change the fuel filter. I'll have to get a fuel pressure tester also. I bet that fuel filter hasn't been replaced in yrs
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Old 03-06-2012, 05:39 PM   #7
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Quote:
Originally Posted by lilrafe87
That has been a thought in the back of my mind lately to convert to maf. As far as fuel problem, I will get a new fuel filter and get a new fuel pump. Only owned one vehicle that had a distributer and I never had to mess with it. I tried turning the distributer on the stang and the connector hits the thermostat housing and won't go any further. Not a total nubie with cars, just never messed with a distribute. Thanks guys
If the distributor is hitting the housing then there is an issue. There should be plenty of room to turn it I'm each direction. I would put the motor at top dead center on number one and restab the distributor so it is right in the center. Then set the timing to about 13 degrees.
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Old 03-06-2012, 06:34 PM   #8
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Quote:
Originally Posted by aegischief

If the distributor is hitting the housing then there is an issue. There should be plenty of room to turn it I'm each direction. I would put the motor at top dead center on number one and restab the distributor so it is right in the center. Then set the timing to about 13 degrees.
That's what I was saying but I wouldnt restab until he checked with light first.with mine at 15* it us close to the housing,so he may not need to turn it more.only a light will tell exactly.
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Old 03-06-2012, 09:18 PM   #9
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I raced my dad's 06 Monte ss and got him off the line, but when I got up to about 4k, it ran like an escort gt lol

---------- Post added at 09:18 PM ---------- Previous post was at 09:17 PM ----------

He also had his traction control on and I was fish tailing like no other
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Old 03-07-2012, 03:33 AM   #10
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Re: 86 mustang gt 5 speed loses power at high RPMs

I feel like every time i read the original post someone already has my thought all ready down. 70% of the time Trojan Horse is on it, me and dreamstang are always right there putting the same thing down haha
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Old 03-17-2012, 09:38 PM   #11
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Put in a new fuel filter and set the timing, but that brings me to my question. When I was setting my timing, I didn't pull the spout connector. Is that a reason Y it still runs like ****?
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Old 03-17-2012, 09:45 PM   #12
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Yes u need to pull the spout connector or the ecm will readjust what u changed it.
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Old 03-17-2012, 09:47 PM   #13
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Re: 86 mustang gt 5 speed loses power at high RPMs

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Originally Posted by lilrafe87 View Post
Put in a new fuel filter and set the timing, but that brings me to my question. When I was setting my timing, I didn't pull the spout connector. Is that a reason Y it still runs like ****?
Yes, If you don't pull the spout connector when setting your base timing, the computer won't recognize the timing change.
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Old 03-18-2012, 03:02 AM   #14
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I shall do that when I wake up tomorrow. By the way, is there a certain sequence I need to do this? Thanks guys, appreciate it
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Old 03-18-2012, 08:44 AM   #15
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Re: 86 mustang gt 5 speed loses power at high RPMs

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I shall do that when I wake up tomorrow. By the way, is there a certain sequence I need to do this? Thanks guys, appreciate it
Just follow the procedure in your Chilton's or Haynes manual.
If you don't have one yet, now is the time to get one.
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Old 03-28-2012, 06:48 AM   #16
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Have it set to 12 deg, runs like a champ now, thanks fellas
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Old 03-28-2012, 04:38 PM   #17
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Re: 86 mustang gt 5 speed loses power at high RPMs

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Have it set to 12 deg, runs like a champ now, thanks fellas
Glad you got it sorted out.
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