misfiring.
 

hey guys. 95 talon tsi awd misfires badly at boost. ive changed the spark plugs/wires. thinking it could be the ignition coil, what do you think?

Re: misfiring.
 

may also want to try swapping out the ignitor/power transistor.

could be a tuning issue, do you have any datalogging equipment?

Re: misfiring.
 

no i dont. car's completly stock cept for suspension, forgot to mention that.

Re: misfiring.
 

Id test the coil and power transistor. Did u gap the plugs and put the wires in the right order.

Re: misfiring.
 

platinum plugs. didnt need to be gapped. and yes the wires are in the right order.

Re: misfiring.
 

I had ngk platinum plugs in my 97 gsx, stock, and it didn't run too well. I bought ngk bpr7es' a couple weeks ago and accel wires and it runs and idles like money now, misfiring issues gone. Except I still have some sort of lag on spool up.

Re: misfiring.
 

Somewhere along the line I've read that platinum plugs are a big NO for DSMs. As to why, I have no idea. I wish I knew, anyone care to enlighten?

Re: misfiring.
 

Anything other than the oem NGKs are a big no.

Re: misfiring.
 

Didn't need to be gapped? Did you check them atleast to make sure? I would never trust that especially with a boosted car. Check that first thing before you go buying anything else.

I would get some NGK's anyway though, I have heard the platinums suck in DSM's too. If you are not running over 16-17psi get the BPR6ES though, the BPR7ES are more prone to fouling and are not generally needed unless you are running higher boost.

Re: misfiring.
 

Oh yeah and Sway, pleast list any relative mods you have on your just if any. It will help you get answers. This problem will most likely be something really simple though.

Re: misfiring.
 

The girl bought the cheapest wires i have ever seen. A simple wire change and all was well.

Re: misfiring.
 

So the problem is fixed or are you talking about someone else?

As far as not gapping/checking plugs, that is just retarded. Who knows how many times they have been dropped before they got to your hands. Also NGK BPR6ES (stock plugs) and BPR7ES (little colder than stock plugs) are the most common plugs used in DSM's. They are pre-gapped from NGK to .032 when you need them gapped to .028-.029 in your DSM.

Re: misfiring.
 

problem fixed. cheap wires was causing the problem.

Re: misfiring.
 

So what did we learn sara?

Re: misfiring.
 

not to buy the cheapest stuff... what can i say, im poor. =P

Re: misfiring.
 

I'd ditch the platinum plugs as well.

Re: misfiring.
 

ATTA Girl! HAHAHA. We all gotta learn sometimes.

Re: misfiring.
 

Its called TURBO LAG. :)

Re: misfiring.
 

God dammit do I have to start closing tech threads when the problem is solved too? Shut up already unless you have something meaningful to add!

Re: misfiring.
 

Sorry i lied, problem wasnt solved. Im pretty sure its the plugs, so I'm going to go buy normal ones today and put em in. So i learned another lesson - no platinum plugs. Thanks guys!

Re: misfiring.
 

The main reason for spark plugs made out of platinum or iridium is to lengthen the time between changes, so you see them stock on factory cars nowdays a lot. Those metals do not erode as quickly as copper and stay in service for a very long time. On our cars though, it is easy to change the plugs, so we usually just use cheap copper plugs and replace them more often. We often run colder plugs that do not clean themselves as well and we tend to run fairly rich mixtures and race gases that can quickly foul the plugs, so it's also not a big deal to throw out an $8 set of copper plugs, compared to a $30-$70 set of platinum or iridium plugs.

Re: misfiring.
 

Sara, did you ever get the plugs to stop backing themselves out?

Re: misfiring.
 

When i got my car it had platinum plugs that were so worn out they made the wires seem bad, the car only had 50K on it when i got it, so i bough tnew wires when that didnt help i checked the plugs and yep those platinum plugs eroded away to about a .125 or more gap, from what i understand patinum plugs are alos prone to causing detonation in these motors wich would wear away the plugs more quickly

Erik