stumbling 5.0

93horseman · February 10th, 2011, 06:21 PM

The symptoms. When accelerating my 93 5.0 will stumble and hesitate also the tach sticks and bounces at about 2500 rpm when this happens. The car idles fine and once you let off the gas and maintain an even speed it runs smoothly.
Things Ive tried to fix it. Swapped coil, ignition module on distributor, swapped 02 sensors, cap and rotor, checked tps voltage and timing on distributor, disconnected msd spark box. No I didn't buy all that stuff! Any ideas what I might try next? Thanks in advance for any help.

MIGHTYJO3YOUNG · February 11th, 2011, 01:08 AM

Have you checked your fuel pressure? I'd check that to see what it looks like. I don't know about the tach. Could also be the maf. My old 95 had those problems minus the tach thing when the maf went bad. It could also be many other things.

93horseman · February 11th, 2011, 10:43 AM

Thanks for the reply. I don't have a fuel pressure gauge but i did run codes and did not get any thing related to the maf. all the codes I gat were related to to missing emissions components. I s there another way to test the maf?

perdue5.0 · February 11th, 2011, 11:42 AM

mine was doing the exact same thing awhile ago and i just had to replace the plug wires...

MIGHTYJO3YOUNG · February 11th, 2011, 12:03 PM

Check for vacuum leaks. You can then clean the maf to make sure it isn't dirty. Then check this out. You can test with a voltmeter.
Part 1 -The Basics of Testing the MAF Sensor

93horseman · February 12th, 2011, 09:28 PM

Thanks for the help mightyjo. Gonna try the maf test monday when I get a chance. Iam little leery of piercing the wires so i might try and swap it with a friends first to see if that cures it.

93horseman · February 15th, 2011, 11:01 AM

Turned out to be the spark plug on number 2 cylinder. There were 2 hairline cracks on the white part ( the insulator?) . Runs great now!

perdue5.0 · February 15th, 2011, 11:11 AM

right on!

MIGHTYJO3YOUNG · February 15th, 2011, 01:08 PM

glad to hear you fixed it!

February 10th, 2011, 06:21 PM	#1
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	stumbling 5.0 The symptoms. When accelerating my 93 5.0 will stumble and hesitate also the tach sticks and bounces at about 2500 rpm when this happens. The car idles fine and once you let off the gas and maintain an even speed it runs smoothly. Things Ive tried to fix it. Swapped coil, ignition module on distributor, swapped 02 sensors, cap and rotor, checked tps voltage and timing on distributor, disconnected msd spark box. No I didn't buy all that stuff! Any ideas what I might try next? Thanks in advance for any help.

February 11th, 2011, 01:08 AM	#2
MIGHTYJO3YOUNG Enthusiast 1992 mustang Lx 13.4@ 106 Join Date: Dec 2006 Location: MD Posts: 569 iTrader: 0 reviews	Have you checked your fuel pressure? I'd check that to see what it looks like. I don't know about the tach. Could also be the maf. My old 95 had those problems minus the tach thing when the maf went bad. It could also be many other things. __________________ 1992 5.0 lx_soon to be powered by a m122 GT500 supercharger

February 11th, 2011, 11:42 AM	#4
perdue5.0 Regular 1992 mustang lx 5.0 Join Date: Feb 2011 Location: washington Posts: 96 iTrader: 0 reviews	mine was doing the exact same thing awhile ago and i just had to replace the plug wires... __________________ However, I thank you, for this pen and ink ammunition.. Thank you for the inspiration!

February 11th, 2011, 12:03 PM	#5
MIGHTYJO3YOUNG Enthusiast 1992 mustang Lx 13.4@ 106 Join Date: Dec 2006 Location: MD Posts: 569 iTrader: 0 reviews	Check for vacuum leaks. You can then clean the maf to make sure it isn't dirty. Then check this out. You can test with a voltmeter. Part 1 -The Basics of Testing the MAF Sensor __________________ 1992 5.0 lx_soon to be powered by a m122 GT500 supercharger

February 15th, 2011, 11:11 AM	#8
perdue5.0 Regular 1992 mustang lx 5.0 Join Date: Feb 2011 Location: washington Posts: 96 iTrader: 0 reviews	right on! __________________ However, I thank you, for this pen and ink ammunition.. Thank you for the inspiration!

February 11th, 2011, 10:43 AM	#3
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	Thanks for the reply. I don't have a fuel pressure gauge but i did run codes and did not get any thing related to the maf. all the codes I gat were related to to missing emissions components. I s there another way to test the maf?

February 12th, 2011, 09:28 PM	#6
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	Thanks for the help mightyjo. Gonna try the maf test monday when I get a chance. Iam little leery of piercing the wires so i might try and swap it with a friends first to see if that cures it.

February 15th, 2011, 11:01 AM	#7
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	Turned out to be the spark plug on number 2 cylinder. There were 2 hairline cracks on the white part ( the insulator?) . Runs great now!

February 15th, 2011, 01:08 PM	#9
MIGHTYJO3YOUNG Enthusiast 1992 mustang Lx 13.4@ 106 Join Date: Dec 2006 Location: MD Posts: 569 iTrader: 0 reviews	glad to hear you fixed it! __________________ 1992 5.0 lx_soon to be powered by a m122 GT500 supercharger

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