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Old 02-20-2014, 08:26 AM   #1
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HELP

My car is skipping and shaking bad at idle. I have changed my spark plugs but no luck. I scanned for a code but no misfire code was showing up. It's bogging down whenever I gas it as well. It's my DD and i can't figure this out. The only code showing up was low voltage keep alive memory. I was going to check my coil packs next. What do you guys think could be wrong?
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Old 02-20-2014, 08:34 AM   #2
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Alternator sounds like the culprit on your case. Get a voltmeter and check the current with all loads on to see if the alternator is going poop.

---------- Post added at 09:34 AM ---------- Previous post was at 09:34 AM ----------

Alternator sounds like the culprit on your case. Get a voltmeter and check the current with all loads on to see if the alternator is going poop. It could have an open diode

---------- Post added at 09:34 AM ---------- Previous post was at 09:34 AM ----------

Alternator sounds like the culprit on your case. Get a voltmeter and check the current with all loads on to see if the alternator is going poop. It could have an open diode
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 02-20-2014, 08:44 AM   #3
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The alternator is good already checked that :/
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Old 02-20-2014, 08:50 AM   #4
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What did you consider good? Im not doubting u but im asking due to at work am alternator also showed good voltage however when i put the tester on it ot showed an open diode
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 02-20-2014, 08:51 AM   #5
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When did it start and how?
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 02-20-2014, 08:55 AM   #6
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The man at autozone said it was going 14v
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Old 02-20-2014, 09:00 AM   #7
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With full load or off full load? How did the problem start was there anything done to the car prior to the problem? Have you checked for the injector ground on the driver side to be plugged in?
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 02-20-2014, 09:05 AM   #8
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I did have water flood my car over a year ago could it be a damage CPU?
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Old 02-20-2014, 09:07 AM   #9
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Idk what any of that stuff is lol
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Old 02-20-2014, 09:09 AM   #10
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It could be a possible ecu due to rust building up on the connectors. You could take the ecu out and check the conditions of the wires and connectors.
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 02-20-2014, 09:12 AM   #11
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Could also be a iac or a mass air flow as well maybe a vacuum hose that broke or rotted away. Try a carb cleaner spray it on the intake and listen for either an increase of epms or a bog down to see if its a vacuum leak

---------- Post added at 10:12 AM ---------- Previous post was at 10:11 AM ----------

Could also be a iac or a mass air flow as well maybe a vacuum hose that broke or rotted away. Try a carb cleaner spray it on the intake and listen for either an increase of rpms or a bog down to see if its a vacuum leak
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 02-20-2014, 09:24 AM   #12
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Alright thanks man ima try these
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Old 02-20-2014, 08:59 PM   #13
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Have you checked your fuel pressure? A restriction in the fuel filter, regulator or fuel pump caused similar symptom's on my 96, I replaced all.
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Old 02-20-2014, 09:16 PM   #14
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Quote:
Originally Posted by Orange95GT View Post
Have you checked your fuel pressure? A restriction in the fuel filter, regulator or fuel pump caused similar symptom's on my 96, I replaced all.
+1 on this as well
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 02-21-2014, 01:09 PM   #15
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HELP

Quote:
Originally Posted by Orange95GT View Post
Have you checked your fuel pressure? A restriction in the fuel filter, regulator or fuel pump caused similar symptom's on my 96, I replaced all.

Where u getting a code when it happend to you?
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Old 02-21-2014, 06:35 PM   #16
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No codes, no check engine light were displayed. In my case it was a failing fuel pump, the fuel pump would pressure up just enough to start and idle but would fall on its face and cough, shake, miss and puke when any throttle was give. I checked my pressure on the fuel rail and everything looked good at idle but would drop considerably when I cracked the throttle open, it would have been easy to diagnose if the fuel pump had completely failed but it worked just enough to make me chase a couple of ghost symptoms and replace a few things not needed. Now I've upgraded my fuel system and am on to bigger and better Mods, my car only had 90k on it when this happened.
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Old 02-21-2014, 07:32 PM   #17
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Quote:
Originally Posted by Orange95GT View Post
No codes, no check engine light were displayed. In my case it was a failing fuel pump, the fuel pump would pressure up just enough to start and idle but would fall on its face and cough, shake, miss and puke when any throttle was give. I checked my pressure on the fuel rail and everything looked good at idle but would drop considerably when I cracked the throttle open, it would have been easy to diagnose if the fuel pump had completely failed but it worked just enough to make me chase a couple of ghost symptoms and replace a few things not needed. Now I've upgraded my fuel system and am on to bigger and better Mods, my car only had 90k on it when this happened.

Sounds like what's going in with me. Whenever I press down on the throttle all the way it coughs and skips and jumps and what not
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Old 02-21-2014, 07:34 PM   #18
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Same happened to me.
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Old 02-22-2014, 07:30 AM   #19
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This just happened to me with my 87 f150 with a 302. I did exactly that and chased a numerous amount of problems because the truck only acted up at half throttle or more. Would rev up and idle fine. Now I know that's not a mustang but I did the following to help me. Most people have their vehicle in park when testing the fuel pressure....so test it driving.

To test my truck I hooked the fuel pressure gauge up and had the line fed up through the hood hinge, with it obviously partially closed and the gauge face down on the windshield with the wiper holding it. I only had to drive 50 yards and I knew. At idle I had 45 psi, give it part throttle she hit 24, floored it and the truck back fired and hit 17psi.

Kinda redneck but I learned it from a 30 year ford mechanic with a 9sec fox. So I took his advice lol. Hope it's helpful
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Old 02-22-2014, 12:30 PM   #20
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Quote:
Originally Posted by jhherndon View Post
This just happened to me with my 87 f150 with a 302. I did exactly that and chased a numerous amount of problems because the truck only acted up at half throttle or more. Would rev up and idle fine. Now I know that's not a mustang but I did the following to help me. Most people have their vehicle in park when testing the fuel pressure....so test it driving.

To test my truck I hooked the fuel pressure gauge up and had the line fed up through the hood hinge, with it obviously partially closed and the gauge face down on the windshield with the wiper holding it. I only had to drive 50 yards and I knew. At idle I had 45 psi, give it part throttle she hit 24, floored it and the truck back fired and hit 17psi.

Kinda redneck but I learned it from a 30 year ford mechanic with a 9sec fox. So I took his advice lol. Hope it's helpful

How do I test the fuel pressure? Never done it before lol
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Old 02-22-2014, 01:29 PM   #21
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Best bet is to spend $15 on a Haynes or Chiltons Manual to walk you through the steps and give you the correct psi.

But the basics are to find the Schrader Valve on the fuel rail. Looks exactly like a valve stem on your rims. The fuel pressure gauge will have a hose and connector that connects to that to read the psi. The Haynes book will show you how to run different test such as the KOEO (key on engine off) and KOER (key on engine running) an everything else. Only issue for you though is finding a friend with a gauge. Most part stores won't rent them and they cost around $50.
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Old 02-22-2014, 01:50 PM   #22
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My uncle and gpa are mechanics so I'll get one from them. Thanks for your help!
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Old 02-22-2014, 04:36 PM   #23
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Awesome dude and it's very easy to do. Keep us posted so you can get that joker fixed.
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Old 02-22-2014, 04:45 PM   #24
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Awesome dude and it's very easy to do. Keep us posted so you can get that joker fixed.

Lol yea man I def will!
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