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Old 07-03-2012, 11:55 PM   #1
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2003 v6 missing

I am new to the forum and have recently picked up a 03 with 80000 miles. it seems to run decent but between 45 and 60 it will shudder and feels like its missing installed new NGK plugs and wires and still does it. Also only gets 15.5 to gallon and want better. It is an automatic. Thinking about underdrive pulleys but want to fix the shudder first.Any ideas?
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Old 07-04-2012, 03:39 AM   #2
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welcome.. did u replace the coils as well? and fuel filter. u might have a bad cylinder
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Old 07-04-2012, 11:11 AM   #3
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Check for vacuum leaks too
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Old 07-04-2012, 04:31 PM   #4
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Re: 2003 v6 missing

fuel filter is gonna make the mpg difference big time...i swap it out on any of my cars at the 40k mile mark...then so on every 40k

as for the shudder i do agree to swap the coil
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Old 07-06-2012, 11:48 PM   #5
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Re: 2003 v6 missing

ok I did change fuel filter plugs air filter plug wires did not do coil took it too my mechanic and he disconnected the EGR for me and told me to drive it for a while seems to have cleared up so far. Coils shouldnt go bad with only 80000 on it. What type of coil is good seems to be an issue as far as quality. An thinking about underdrive pulleys but want too make sure shes running good first before any mods. Also this car is going to be my daily driver and am only getting 15.5 mpg kind of dissaponted. My olds got 21 with a 3.1 v6
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Old 07-07-2012, 10:24 AM   #6
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Your mpg is not normal. We get much more. Oem coils are what need to replace if your coils are bad. You can't say when or when not something needs to be replaced. That's like having a tranny go out at 30k but refusing to say its the tranny cuz it should last a lot longer. MSD has some coil packs but do not get screaming demons.. I would stick to oem coil pack tho. It's made for your car.

Don't get me wrong tho I'm not saying your coils aren't good anymore. Hope the issues clear up for you
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Old 07-07-2012, 10:29 AM   #7
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i got ford motorcraft coils and they work like a charm
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Old 07-07-2012, 12:15 PM   #8
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Quote:
Originally Posted by V6 stang
Your mpg is not normal. We get much more. Oem coils are what need to replace if your coils are bad. You can't say when or when not something needs to be replaced. That's like having a tranny go out at 30k but refusing to say its the tranny cuz it should last a lot longer. MSD has some coil packs but do not get screaming demons.. I would stick to oem coil pack tho. It's made for your car.

Don't get me wrong tho I'm not saying your coils aren't good anymore. Hope the issues clear up for you
What's the problem with screamin demons?
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Old 07-07-2012, 12:23 PM   #9
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Re: 2003 v6 missing

Car is running good now but mpg is still at 15 what should a stock 03 with an auto get? Think Im going to sea foam it before the next oil change. Also ther is a tick when it first fires up then goes away when it warms.Sw a post where someone had an exhust leak like that it kind of sounds like an exhaust leak but wouldnt it get worse when warm
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Old 07-07-2012, 12:39 PM   #10
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Quote:
Originally Posted by Eric Paris
Car is running good now but mpg is still at 15 what should a stock 03 with an auto get? Think Im going to sea foam it before the next oil change. Also ther is a tick when it first fires up then goes away when it warms.Sw a post where someone had an exhust leak like that it kind of sounds like an exhaust leak but wouldnt it get worse when warm
20-25mpg no an exhaust leak gets better when warm.. Everything heats up and closes the hole but then usually comes back when putting a "load" on the motor.. Are you gonna put Seafoam the oil? If so I don't recommend it..
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Old 07-07-2012, 03:39 PM   #11
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What about seafoam in the oil?
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Old 07-07-2012, 06:29 PM   #12
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Originally Posted by sixpac

What's the problem with screamin demons?
Heard lots of bad things from them. After 3 months not workin good etc. I'd just stick to stock
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Old 07-07-2012, 07:20 PM   #13
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Re: 2003 v6 missing

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Originally Posted by sixpac View Post
What's the problem with screamin demons?
Junky coils that cause issues....
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Old 07-08-2012, 09:25 AM   #14
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Re: 2003 v6 missing

Ok starting to get frustrated. After more driving the surging continues have found that it is happening between 1500 and 1900 rpm. Yes I was going to sea foam oil gas and intake. then change the oil I think the tick is exhaust what kind of gaskets do you guys use. Well I guess buying a new coil is next I wanted an aftermarket one to pump up the juice but it doesn't seem like there is a popular concensus on what is a good one other than stock. Where would you test for vacuum and what should it read. Also what should the fuel pressure be.
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Old 07-08-2012, 10:01 AM   #15
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Did u check for any air leaks
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Old 07-08-2012, 10:47 AM   #16
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Quote:
Originally Posted by Eric Paris
Ok starting to get frustrated. After more driving the surging continues have found that it is happening between 1500 and 1900 rpm. Yes I was going to sea foam oil gas and intake. then change the oil I think the tick is exhaust what kind of gaskets do you guys use. Well I guess buying a new coil is next I wanted an aftermarket one to pump up the juice but it doesn't seem like there is a popular concensus on what is a good one other than stock. Where would you test for vacuum and what should it read. Also what should the fuel pressure be.
Yeah don't leave Seafoam in the oil... Um a msd probably wouldn't be a bad choice... For a coil..
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Old 07-08-2012, 10:57 AM   #17
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No you leave it in the oil for like 50 miles to let it clean the inside. When I did mine the engine was clean so didnt do much.
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