GT Mustangs

Quball19 · 07-01-2012, 03:41 AM

Ok, when go to drive car starts out good, fires right up, let warm up a min drive off. Car runs great till it gets warmed up(maybe 15mph miles) then starts acting like missing out, or sucking air,really dogs out. Check for vacuum leaks did not find none, checked plug wires all are good. Any ideas.........
Ps....new cap , rotor , plugs have about 200 miles on them.

ColeJohnson · 07-01-2012, 03:45 AM

Quote:

Originally Posted by Quball19

Ok, when go to drive car starts out good, fires right up, let warm up a min drive off. Car runs great till it gets warmed up(maybe 15mph miles) then starts acting like missing out, or sucking air,really dogs out. Check for vacuum leaks did not find none, checked plug wires all are good. Any ideas.........
Ps....new cap , rotor , plugs have about 200 miles on them.

Did you gap the plugs correctly?

Quball19 · 07-01-2012, 03:48 AM

Yes just started doing this about week or some ago

---------- Post added at 03:48 AM ---------- Previous post was at 03:46 AM ----------

Seems like it does it after it is heated up.... Been 100 degrees outside too

Trojan Horse · 07-01-2012, 06:40 AM

Is your timing set properly?If it is retarded to much it can cause the engine to heat up and misfire.

This could also be caused by the pick up coil (PIP) in the distributor or the TFI module.

Quball19 · 07-01-2012, 06:42 AM

Quote:

Originally Posted by Trojan Horse

Is your timing set properly?If it is retarded to much it can cause the engine to heat up and misfire.

This could also be caused by the pick up coil (PIP) in the distributor or the TFI module.

Ive had TFI checked its good. Timing was set by tuner, could it have moved over the period of few months?

Trojan Horse · 07-01-2012, 06:56 AM

Quote:

Originally Posted by Quball19

Ive had TFI checked its good. Timing was set by tuner, could it have moved over the period of few months?

No, it should not unless it was left loose.
Check it anyways to be sure.
All it takes is a timing light and a few minutes of your time.

Quball19 · 07-01-2012, 07:05 AM

I could spare a few mins of time. I' ll we got is time. I will check when get off work.
Ps...with mods I have (not sure what tuner set at) what you think should be at ?

Trojan Horse · 07-01-2012, 07:15 AM

Quote:

Originally Posted by Quball19

I could spare a few mins of time. I' ll we got is time. I will check when get off work.
Ps...with mods I have (not sure what tuner set at) what you think should be at ?

10° to 14° BTDC
Your Chiltons Manual will show you how to do check and adjust if needed.

Quball19 · 07-10-2012, 05:44 PM

Ok after this hundred degree weather broke got stang out with timing set at 14° still when gets hot acts like its missing out. Runs great in morning, then after driving home from work , (which is 5 mikes away) ran good until got home started acting like missing. Confused ...

---------- Post added at 05:44 PM ---------- Previous post was at 05:43 PM ----------

Should I try to advance more?

dreamstang · 07-10-2012, 06:41 PM

do not advance any more. you are already on the high end. do you run 93 in it? are you sure the misfire isnt detonation? most people can get away with 14* btc but some cant. the extra hot air maybe helping create detonation.

Quball19 · 07-10-2012, 06:45 PM

Quote:

Originally Posted by dreamstang

do not advance any more. you are already on the high end. do you run 93 in it? are you sure the misfire isnt detonation? most people can get away with 14* btc but some cant. the extra hot air maybe helping create detonation.

Yes runs 93. Well not sure if detonation? Think should back down some? Would it only do it when gets warm?

dreamstang · 07-10-2012, 06:48 PM

yes it would be more likely when warm. and it would also make a pinging type noise. or like bouncing marbles..

try backing it off 2* with the proper timing procedure.

Quball19 · 07-10-2012, 06:49 PM

If so should I back down to 10*? TH said might be to retarded : confused

dreamstang · 07-10-2012, 06:55 PM

he said that because we were talking miss.if it is detonation then its a different story. and 14* is usually ok. but sometimes risky. its almost always ok with 93 octane. it is also possible you had crappy gas.

do you hear any noises?

i think since you are having problems it would be a good idea to be between 10-12* once you get resolved then readvance it.

im sure trojan will be back on with his expertise. we will probably better tell you if its detonation or not.

Quball19 · 07-10-2012, 07:01 PM

Quote:

Originally Posted by dreamstang

he said that because we were talking miss.if it is detonation then its a different story. and 14* is usually ok. but sometimes risky. its almost always ok with 93 octane. it is also possible you had crappy gas.

do you hear any noises?

i think since you are having problems it would be a good idea to be between 10-12* once you get resolved then readvance it.

im sure trojan will be back on with his expertise. we will probably better tell you if its detonation or not.

Do not hear noise. Runs great when first get going for about 15 miles, then when gets warmed up runs real dogish.......
Thanks I will turn it down tomorrow

dreamstang · 07-10-2012, 07:03 PM

No problem. You still may have other issues. But this is an easy one to rule out.

Trojan Horse · 07-11-2012, 02:50 AM

The hotter the engine gets the easier it is for it to detonate.You may have trouble with the PIP. Sometimes when they are going bad the engine will miss or die completely when it gets hot.
There may be a testing procedure for it in the Useful Info thread.
I would also test the coil.

Quball19 · 07-11-2012, 03:55 AM

Quote:

Originally Posted by Trojan Horse

The hotter the engine gets the easier it is for it to detonate.You may have trouble with the PIP. Sometimes when they are going bad the engine will miss or die completely when it gets hot.
There may be a testing procedure for it in the Useful Info thread.
I would also test the coil.

Don't act like wanting to die, (idles good) its under acceleration

Trojan Horse · 07-11-2012, 12:10 PM

Quote:

Originally Posted by Quball19

Don't act like wanting to die, (idles good) its under acceleration

That was just another symptom that you could possibly experience.

Quball19 · 07-11-2012, 12:15 PM

Lowered timing down to 10* at lunch time, drove its back to work seem to be ok. Will know more after work, going for a drive

Quball19 · 07-11-2012, 02:26 PM

Well took for good drive, running good. 92 degrees outside drove about 25 miles with not ill effect.
Thanks

Now with mods I have ( I consider being good ones) why is its hard for me to run higher on timing? You hear of people with not quite the mods I have running good at 14*.
Just asking..........

Trojan Horse · 07-11-2012, 03:15 PM

Quote:

Originally Posted by Quball19

Well took for good drive, running good. 92 degrees outside drove about 25 miles with not ill effect.
Thanks

Now with mods I have ( I consider being good ones) why is its hard for me to run higher on timing? You hear of people with not quite the mods I have running good at 14*.
Just asking..........

Bad fuel.
Timing chain loose so timing is jumping around to much.
Cooling system issues, such as inadequate pump flow or debris in the engine.
Spout connector bad.
Maybe the cam was installed without degreeing it in and it is already advanced to far.
Etc., etc..

Quball19 · 07-12-2012, 05:08 PM

Well its back. Thought all was good...NOT!!!

Quball19 · 07-13-2012, 02:13 PM

Quote:

Originally Posted by Trojan Horse

Bad fuel.
Timing chain loose so timing is jumping around to much.
Cooling system issues, such as inadequate pump flow or debris in the engine.
Spout connector bad.
Maybe the cam was installed without degreeing it in and it is already advanced to far.
Etc., etc..

Ok can't you explain how cooling system effects this........

XXSTEVEO66 · 07-13-2012, 03:07 PM

Quote:

Originally Posted by Quball19

Ok can't you explain how cooling system effects this........

Coolant system just goes along with the,fact that a hotter engine is more likely to detonate..bad pump will inhibit proper coolant flow ie it will run hotter.debris will obviously not allow proper flow through the block rad ect..and as TH stated this is just another possibility for your timing issue.

Quball19 · 07-13-2012, 04:02 PM

I only ask because I was looking at cooling system started with belt... Low and behold (I didn't do this builder did) belt was run wrong, it was turning pump wrong way. Bought longer belt run proper way according to chilton

dreamstang · 07-13-2012, 04:05 PM

it happens. that should fix your problem. older stangs had a different rotation water pump.

Quball19 · 07-13-2012, 04:10 PM

Do you think I could try bumping my timing back up?

---------- Post added at 04:10 PM ---------- Previous post was at 04:10 PM ----------

Lowered to 10° when all this started

dreamstang · 07-13-2012, 04:13 PM

if your temp is down, i would say give it a shot. just becareful and listen for detonation.

Quball19 · 07-13-2012, 04:14 PM

Gotcha thanks again

dreamstang · 07-13-2012, 04:15 PM

your welcome

Quball19 · 07-13-2012, 04:16 PM

Quote:

Originally Posted by dreamstang

if your temp is down, i would say give it a shot. just becareful and listen for detonation.

Funny about temp gage never showed hot, but engine was putting off lots of heat.....have to change gage, or sensor next.

dreamstang · 07-13-2012, 04:25 PM

Quote:

Originally Posted by Quball19

Funny about temp gage never showed hot, but engine was putting off lots of heat.....have to change gage, or sensor next.

i would go aftermarket definitly.

Quball19 · 07-13-2012, 04:28 PM

Do have aftermarket on there. It only showed as high as 170 never really got higher.before changed belt ...wierd

dreamstang · 07-13-2012, 04:29 PM

hmmm. that is wierd. where is it hooked up at?

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