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Old 05-22-2015, 09:08 AM   #1
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Idling Problem

Hey guys, so I have a question. My 95 mustang V6 (which is a 4.3 after being stroked and bored .30 over, but not by myself) was running fine, when one day I went out to start it. It started fine, but then it idled really rough and died within 5 seconds of starting. Here's the best I can describe the situation after trying to play with it for a while:
1.) It starts fine.
2.) It has enough gas.
3.) The exhaust smells like gasoline.
4.) Upon starting it, when the car does the initial fire and the RPMs go up to about 2k, it revs smoothly like it normally would.
5.) The engine shakes when this happens.
6.) I changed the spark plug wires after this started happening, so it's not those.
7.) I cleaned the intake O2 sensors, so not that either.
8.) If you keep on the throttle, you can keep the engine going at around 1k RPMs, and even shift and drive it. It's still rough (unless you get it up to about 2k, in which case it revs fine), but drivable. As soon as you get off of it, it will drop the RPMs to about 300-500, and die after about 5 seconds.

That's about all I got. Any thoughts?
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Old 05-22-2015, 09:10 AM   #2
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Oh, also. This is pretty important. This happened once before hand. I was playing with it, and I took the spark plugs out, wiped them off, and stuck them back in. The car ran fine for about another week, then it did the same thing. So, I tried to clean them again, but to no avail.
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Old 05-22-2015, 03:34 PM   #3
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I'd start by changing the spark plugs themselves. Make sure they have the correct gap.


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Old 05-22-2015, 03:39 PM   #4
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Will do. I'll let you know how that goes. Thanks!


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Old 05-23-2015, 02:20 PM   #5
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👍🏻 keel us informed


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Old 05-23-2015, 07:34 PM   #6
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Okay, so I pulled the plugs (which sounds more morbid than it was), and they had black tips. They were also covered in a fluid that was murky brown like oil, but smelled like gasoline. What could this mean? Click image for larger version

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Old 05-24-2015, 09:15 AM   #7
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So, I think that means that it's running rich. Now, because the engine had the 4.3 conversion done to it, does that mean that I'm going to need a new ECU? Or can I give it a tune via external computer (I.e. Hooking up a laptop to it and changing the preferences on it)?


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Old 05-25-2015, 07:36 AM   #8
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Also, I've changed the spark plugs, and no noticeable change has occurred. It still chokes out.


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Old 05-27-2015, 07:35 PM   #9
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Any CEL to check? When's the last time you cleaned MAF ?

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Old 05-27-2015, 08:07 PM   #10
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Idling Problem

Check MAF sensor, and your throttle body. Both of them, being dirty, can cause the engine to run bad. If that doesn't fix it, I've got one more thing to try. I need to research on it some more, then you can try it.


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Old 05-27-2015, 11:32 PM   #11
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Hmmm... I tried cleaning the MAF, which was pretty dirty. I thought that that would do it, but nope. I didn't think of the throttle body though. I guess if the MAF was dirty, then dirt probably got in the throttle body, huh? Thanks! And just out of curiosity and my lack of faith, what's the other thing you're thinking of?


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Old 05-27-2015, 11:34 PM   #12
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Oh, and the SEL is on, but it's an OBD I. I don't think I can read the code on that.


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Old 06-04-2015, 08:10 PM   #13
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Well, I messed with the thing for a while, and just couldn't get it to start working. So, I took it to a much older and much more experienced and knowledgable mechanic friend. He took a look at it, and found out that the guy that did the stroking/boring/rebuilding of the engine plugged some of the electrical in backward. -.- As to what, I didn't ask. In addition to that, he noticed that the clamps on the air intake where missing, and said that that would contribute to any problems. After fixing those two things, the car now runs fine! Also, he has an OBD I reader, and found that the SEL that's on is because of a couple of bad O2 sensors, so I'm sure that that didn't help either. So, mystery solved. Thanks for all the help guys, I appreciate it!


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Old 06-05-2015, 03:51 AM   #14
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Quote:
Originally Posted by Jaytraeg View Post
Well, I messed with the thing for a while, and just couldn't get it to start working. So, I took it to a much older and much more experienced and knowledgable mechanic friend. He took a look at it, and found out that the guy that did the stroking/boring/rebuilding of the engine plugged some of the electrical in backward. -.- As to what, I didn't ask. In addition to that, he noticed that the clamps on the air intake where missing, and said that that would contribute to any problems. After fixing those two things, the car now runs fine! Also, he has an OBD I reader, and found that the SEL that's on is because of a couple of bad O2 sensors, so I'm sure that that didn't help either. So, mystery solved. Thanks for all the help guys, I appreciate it!


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Missing clamps explains the dirt on the maf. Hopefully you didn't get too much dirt in there. I would consider an oil change
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Old 06-20-2015, 03:37 PM   #15
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Originally Posted by natestang07 View Post
Missing clamps explains the dirt on the maf. Hopefully you didn't get too much dirt in there. I would consider an oil change
Agreed .


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