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Old 02-24-2014, 01:08 PM   #1
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Check engine

94 gt mustang was driving great. The alternator went out changed it. Now I am having a slight misfire and idle surge. Changed plugs and wires. Misfire went away. Drove to work misfire returned and check engine light. About half way to work car smoothed out check engine light went off. Please help?



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Old 02-24-2014, 02:25 PM   #2
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Pull codes and see what it is. Your PIP (pickup in distributor) is likely on the way out if my past experiences are anything to go by. Pull the cap on the distributor and look in there, if there is a silvery dust all over the inside of it that's likely the culprit. New dizzy and coil fixes that.
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Old 02-24-2014, 03:59 PM   #3
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Thanks Scotty

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---------- Post added at 09:59 PM ---------- Previous post was at 09:58 PM ----------

And the idle surge.possibly idle air control valve?

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Old 02-24-2014, 06:25 PM   #4
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Those are common points of failure as well.
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Old 02-26-2014, 09:37 AM   #5
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.any other pointers for improving rough idle and an off and on slight shudder @cruising speed 40mph-50mph

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Old 02-26-2014, 09:47 AM   #6
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Plugs, wires, clean MAF sensor, IAC etc... make damn sure if you do the plugs to get a torque wrench or you can blow out the threads really easy. 12 ft lbs and that is it.
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Old 02-26-2014, 09:48 AM   #7
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Automatic car?
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Old 02-26-2014, 10:14 AM   #8
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Yep

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Old 02-26-2014, 10:46 AM   #9
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Check the injectors as well. They may need servicing/replacing or simply may not be working due to a faulty electrical connection
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Old 02-26-2014, 10:52 AM   #10
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What type of injectors would you suggest

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Old 02-26-2014, 11:04 AM   #11
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Kinda had a feeling it would be an automatic. The 40-50 mph shudder that you're experiencing......lets address that.
Does it kinda of give you the sensation that you are hitting the rumble strips on the roadside? This is a common problem with automatic overdrive Fords. I'll await your reply before going any further.
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Old 02-26-2014, 11:11 AM   #12
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If your engine is stock then which ever ones Ford specifies for you motor
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Old 02-26-2014, 11:18 AM   #13
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Yeah that would describe it. Its doesn't do that all the time. Usually at first but smooths out after driving awhile.

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Old 02-26-2014, 11:24 AM   #14
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Ok, sounds like you're experiencing a fairly common concern...torque converter shudder. Has the fluid been recently changed?
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Old 02-26-2014, 11:58 AM   #15
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No should probably do that

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Old 02-26-2014, 12:13 PM   #16
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Ok, here is the typical fix. Change the fluid, and use a good quality fluid, and of the proper type. Heres the trick to it. Ford offers a friction modifier additive, which is designed to address the torque converter shudder. Add the recommended amount to the fluid, give it time to soak into the clutches, and your symptoms should dissipate. Theres also a product available locally at the parts stores in a red tube, made by "Dr. Tranny". This is also a variation of friction modifier. I've seen it work and not work. I'd recommend the Ford addictive, but if that's not possible, go for the retail store stuff by Dr. Tranny.
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Old 02-26-2014, 12:14 PM   #17
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Drain/fill then trans for sure. DO NOT GET IT FLUSHED! Shops will try to tell you that flushing is a good thing, it is not. Put car on jackstands, remove pan/drain fluid. Access torque converter drain plug, drain that, new filter, gasket should be re-usable, pan back on, filter plug back in, fill with factory spec level of Mercon V.
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Old 02-26-2014, 12:15 PM   #18
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Quote:
Originally Posted by olds442111 View Post
Ok, here is the typical fix. Change the fluid, and use a good quality fluid, and of the proper type. Heres the trick to it. Ford offers a friction modifier additive, which is designed to address the torque converter shudder. Add the recommended amount to the fluid, give it time to soak into the clutches, and your symptoms should dissipate. Theres also a product available locally at the parts stores in a red tube, made by "Dr. Tranny". This is also a variation of friction modifier. I've seen it work and not work. I'd recommend the Ford addictive, but if that's not possible, go for the retail store stuff by Dr. Tranny.
^Yep.


Is it safe to google "Dr. Tranny" on a work computer?
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Old 02-26-2014, 12:15 PM   #19
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Add the one thing left out by Scotty and you're good to go. Friction modifier
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Old 02-26-2014, 12:16 PM   #20
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Dangitt Scotty, we are walking on each other, haha
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Old 02-26-2014, 12:17 PM   #21
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Drain/fill only copy that. When in park my car idles as if it has a cam but it is all factory..... lights dim when on as due to the idle and gauges surge as well during idle any idea

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Old 02-26-2014, 12:19 PM   #22
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First off. Any check engine light? If so, have codes been extracted?
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Old 02-26-2014, 12:19 PM   #23
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Safe to Google huh lol

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Old 02-26-2014, 12:19 PM   #24
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Very well could be an IAC. Again, pull codes if you haven't already and see if anything is there that you are not already aware of. Autozone and stores like it usually offer this service for free.
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Old 02-26-2014, 12:20 PM   #25
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Google what?
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Old 02-26-2014, 12:20 PM   #26
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Lol, ok I'm going to go look at cell phone accessories for awhile to stop walking all over olds.
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Old 02-26-2014, 12:21 PM   #27
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Nooooo. I'm about to leave for a doc appointment, so you got this for a while Though I do have my phone with me, with the mobile app. I'm keeping my eye on ya
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Old 02-26-2014, 12:28 PM   #28
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When I took it AutoZone dude told my car was to old I needed a 1.5 What ever that is

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---------- Post added at 06:28 PM ---------- Previous post was at 06:27 PM ----------

I will get the check engine diagnostics now

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---------- Post added at 06:28 PM ---------- Previous post was at 06:28 PM ----------

Keep yall posted

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Old 02-26-2014, 12:31 PM   #29
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Oh, you are OBD1, google on how to do the check engine light trick. Basically you jumper a connector and then follow the directions. Your CEL will blink in a sequence which will translate to a code. Like for example 531 (just random, no idea what that code is) will be 5 fast flashes, paus, 3 fast flashes, pause, 1 fast flash.
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Old 02-26-2014, 12:34 PM   #30
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Wow who thought to do that

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Old 02-26-2014, 12:39 PM   #31
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Ford
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Old 02-26-2014, 01:51 PM   #32
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Lol yeah. OBDII started in 1994 actually on the V6 but didn't hit the GT until the modular went in in 1996. OBDII is much better for a variety of reasons. Obviously the code scanning but also no sniffer in my state if you have a OBDII vehicle. Plug in and as long as the emissions stuff sends back a green light to the computer they slap a sticker on the windsheild and see you in 2 years.
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Old 02-26-2014, 02:14 PM   #33
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I went to AutoZone there scanner would not read my cpu

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Old 02-26-2014, 02:45 PM   #34
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Yeah they can only do OBDII, you have to do the paper clip jumper trick and read your CEL. Like I said, google how to do it, I have not done it in YEARS and I forget but its quick and pretty painless.
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Old 02-26-2014, 03:22 PM   #35
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I saw a code reader for 30 bucks im going on and copping it

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