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Old 05-21-2014, 08:35 PM   #1
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Spark plugs

I changed my spark plugs in my 2002 mustang and after I got done started it up it started right up but then reved weird from 1000 rps to 500 then shut off started it again drove home and didn't happen but now if I'm in neutral it revs between 1000 and 0 the shuts off no check engine light tho . need help

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Old 05-21-2014, 08:36 PM   #2
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Did you get your MAF reconnected?
IAC hose?
PCV hose?
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Old 05-21-2014, 08:37 PM   #3
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The maf is connected and the hoses are on

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Old 05-21-2014, 08:38 PM   #4
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Plugs were suppose to be pre gapped I can only think one may not have been

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Old 05-21-2014, 08:40 PM   #5
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I would say to recheck that all your COPs are properly seated and connected, all injectors are connected and that everything is put back right.

But it sounds to me like a MAF or IAC problem.
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Old 05-21-2014, 08:41 PM   #6
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I dont think an improperly gapped plug could cause anything like that, unless it was completely closed.
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Old 05-21-2014, 08:42 PM   #7
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Well I guess good thing I have a bbk maf coming tomorrow..thanks for the info

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---------- Post added at 01:42 AM ---------- Previous post was at 01:41 AM ----------

There are upgrades on the car and it is manual

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Old 05-21-2014, 08:45 PM   #8
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Im not saying that the old one is bad.

If the car ran right before the plug swap, and runs bad after the swap, then the answer is a faulty plug, or improper reassembly.

But a faulty would would be pretty noticeable, because you would be losing a whole cylinder.

So thats why Im suggesting to retrace your work.
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Old 05-21-2014, 08:47 PM   #9
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Alright will do . and I understand the old isn't bad I orderd the bbk Maf beforehand for the cold air intake and bbk single throttle intake

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Old 05-21-2014, 08:49 PM   #10
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And. If there was a misfire I should see a light pop or a code on my plug in

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Old 05-21-2014, 08:50 PM   #11
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Ya. If you had a completely faulty plug, youd probably be getting a flashing CEL.
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Old 05-21-2014, 08:53 PM   #12
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Alright well I'll check I did everything correct and repost thanks

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Old 05-21-2014, 09:31 PM   #13
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If anyone has any other info let me know I will be taking it apart tomorrow. And changing the coils anyways so info on what I should do would be great

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Old 05-21-2014, 09:45 PM   #14
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There's no such thing as "pre-gapped" spark plugs.
How would they know the right gap?
I'd check them all.
You might try disconnecting your battery for about 20 minutes so that the computer can clear it's memory and relearn the idle. Reconnect the battery and start the car and let it idle for about 15 minutes without touching the accelerator pedal. Then drive the car.
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Old 05-21-2014, 09:49 PM   #15
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Thanks that helps and will do.

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Old 05-22-2014, 01:00 PM   #16
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Agreed, no such thing as pre-gapped. You MUST ALWAYS gap your own plugs. Also what brand and type did you put in because they aren't all created equal.

I'd pull them back out and put in 8 new Autolite 103 coppers ($1.99 each) gapped to .054 and torqued to 12 ft lbs.
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Old 05-22-2014, 02:12 PM   #17
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I think you need to check all of your vacuum lines again. This really sounds like you have an air leak, regardless what the spark plug gap is. I know you weren't messing with anything air related, but sometimes it's easy to lean on the air intake while you're working and disconnect something by mistake. Also, double check and tighten the clamps around the air intake couplers. They tend to come lose easily!

I wish you the best of luck with this! Let me know if I can be of any other assistance.

Shane
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Old 05-22-2014, 06:14 PM   #18
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Thanks guys I replaced all the coils and put the bbk maf on in consistently revving at 700 now no problems I let it sit for 20 min after resetting the comp idleing now works great

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Old 05-22-2014, 06:16 PM   #19
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O and BTW. Spark plugs I checked they were pre gapped to .054... So yes performance plugs Do come gapped sometimes

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Old 05-22-2014, 06:21 PM   #20
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And my problem was I didn't have one completely tight

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Old 05-22-2014, 07:51 PM   #21
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I think that platinum and iridium plugs are pregapped, because using a gapping tool can destroy the precious metal coating on them.
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Old 05-22-2014, 08:07 PM   #22
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I think that platinum and iridium plugs are pregapped, because using a gapping tool can destroy the precious metal coating on them.
Doesn't matter, some idiot could have dropped one and messed up the gap, you always check. I run copper though. More power and easy to read the plugs. They last 30-40k anyway and it only takes an hour to change them at most and they are $2 each. The nickel-cadmium/plutonium coated ones are just ways to take more of your money.
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Old 05-22-2014, 08:11 PM   #23
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I have zex copper 3 pronged plugs in it...

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Old 05-22-2014, 08:12 PM   #24
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64 for 8

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Old 05-22-2014, 08:18 PM   #25
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And yes it took an hour and 30 min to do but I also changed the coils on it

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Old 05-22-2014, 08:52 PM   #26
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I will say I learnd my lesson I went to school for this and just lost a lot through not doing it for so long . and will be checking before doing

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Old 05-23-2014, 12:07 AM   #27
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Quote:
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I have zex copper 3 pronged plugs in it...

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Oh. I thought that we were talking about spark plugs... Not something that resembles a medical device.

Yeah, it would be difficult to gap those, or accurately measure the gap with most tools...

Glad that you got it running good!
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Old 05-23-2014, 12:20 AM   #28
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Ya lol but it runs damn good now

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Old 05-23-2014, 12:22 AM   #29
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Next I'm thinking of doing a tune.

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Old 05-23-2014, 12:24 AM   #30
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And just so people know if u get these plugs do not * at all try to gap them ... They r for performance and trying can ruin one...

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Old 05-23-2014, 12:31 AM   #31
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Just saying
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Old 05-23-2014, 06:58 PM   #32
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Multi pronged plugs are snake oil. Just another way to part you with more of your hard earned money. You don't need anything more than $2/ea copper plugs.
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Old 06-03-2014, 09:53 AM   #33
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I'm happy with them revs perfectly sounds better and ok.

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Old 06-03-2014, 07:48 PM   #34
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Quote:
Originally Posted by scottydsntknow View Post
Agreed, no such thing as pre-gapped. You MUST ALWAYS gap your own plugs. Also what brand and type did you put in because they aren't all created equal.

I'd pull them back out and put in 8 new Autolite 103 coppers ($1.99 each) gapped to .054 and torqued to 12 ft lbs.

You pick them up at WalMart?
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Old 06-03-2014, 08:11 PM   #35
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No autozone. you can order them on rockauto for like a buck but then you have to pay the shipping so its not much savings and you have to wait. I'm talking the Autolite 103 coppers, not the plats or anything. Coppers are always going to make the best power, plats just last longer but they are so easy to change it really doesn't matter IMO.
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