Replaced spark plugs... engine turns but not start?

**bottom-a4-03** · 07-08-2008 11:01 AM

I replaced the plugs today, went with NGK Iridium ones, I tried gap between 25 to 32 and no go. I threw in the old plugs and it still will not start. I know I got feul because I can smell it on the plug and exhaust. what gives? any ideas?

**IronAudi** · 07-08-2008 11:17 AM

Are you sure you are getting a spark pull out a plug and pack put the plug init and turn over the engine if the plug fires you have power if not look at battery connections and plug power. Try reseting your ECU as you may have tripped something.

**bottom-a4-03** · 07-08-2008 11:34 AM

I checked for spark.. I got no spark. I touch the plug to the ground wire and had my GF start I saw no spark. I don't know if it matters but I did go from copper plugs to iridium plugs
how do you reset an ECU?

**treemolecule** · 07-08-2008 11:45 AM

if you're APR chipped, use the fault code erase, otherwise just disconnect the hot side of the battery for about 3 mins, take the whole terminal assembly off the post, not just the first wire. if you have original audi symphony sound system, youll need the key code again for it, if its audi symphony II, the code will not need to be re-entered after you connect the battery again.

are you sure you're filling the fuel bar with an initial gas charge? (when you turn the key from off to acc or on is when it charges the fuel bar)

**bottom-a4-03** · 07-08-2008 11:58 AM

running revo.

"are you sure you're filling the fuel bar with an initial gas charge? (when you turn the key from off to acc or on is when it charges the fuel bar)"

I'm not sure what you mean. I have fuel, I can see it on the plugs. I got it disconnected right now, will try to strat in a few mins... I also went back to the old coil packs and plugs. I have 4 spares. will let you know what happens

**04QuattroTurbo** · 07-08-2008 12:05 PM

If you are not getting a spark you may want to check the coilpacks and the wiring harness.

**bottom-a4-03** · 07-08-2008 12:39 PM

had battery unplugged for over 15mins. I'm also back to my old plugs that and old coil packs

still will not start.....

lost for ideas, any help appreciated. otherwise its to the auto shop. :(

**treemolecule** · 07-08-2008 01:20 PM

hmm, check every plug?

**PDX04a4** · 07-08-2008 04:20 PM

might want to scan it for codes if possible. i just had a problem with my spark, i also got no spark. ended up being a wire that runs from the ECM relay (219) to the coil pack connectors. it had 130,000 ohms of resistance, only supposed to have 1.5 max.

there are a lot of potential problems you can have though, ECU not recognizing the plugs, coil packs not getting power (my problem), crankshaft sensor, etc etc.

really need to scan it for codes.

**bottom-a4-03** · 07-08-2008 11:54 PM

OK, Thanks all for your help. The problem turned out to be a blown Engine Management Fuse. There are 2 for our cars. 20amp and a 15amp. The 20 was blown because of the iridium plugs + Hitachi coil packs. I ran the Hitachi with coppers and platinums and its fine, Ran iridium with OEM packs and its fine. ridium plugs + Hitachi coil packs = blown 20amp Engine Management Fuse.

Beware of this combo. I used up my sunroof and another 20amp fuse to test.. have to get some platinum plugs and a couple 20amp fuses tomorrow.

**04QuattroTurbo** · 07-09-2008 12:49 AM

Originally Posted by bottom-a4-03

OK, Thanks all for your help. The problem turned out to be a blown Engine Management Fuse. There are 2 for our cars. 20amp and a 15amp. The 20 was blown because of the iridium plugs + Hitachi coil packs. I ran the Hitachi with coppers and platinums and its fine, Ran iridium with OEM packs and its fine. ridium plugs + Hitachi coil packs = blown 20amp Engine Management Fuse.

Beware of this combo. I used up my sunroof and another 20amp fuse to test.. have to get some platinum plugs and a couple 20amp fuses tomorrow.

Hitachi's, those are the B5's packs right? The bolt-on ones that we can "upgrade" to? BTW, nice to see another Bay Area member!

**bottom-a4-03** · 07-09-2008 08:24 AM

yes, the B5 coil packs. also the iridium plugs I used were NGK BKR6EIX. Thanks for everyones help.

**CO AVANT** · 07-09-2008 09:31 AM

Originally Posted by bottom-a4-03

OK, Thanks all for your help. The problem turned out to be a blown Engine Management Fuse. There are 2 for our cars. 20amp and a 15amp.

what year is your car? I have 4 engine management fuses on my late '03.

**bottom-a4-03** · 07-09-2008 01:12 PM

its an 03... you're right, there are more than 2.. i was replacing the fuses this morning and I saw 2 20amp and 1 15amp.. I didn't look for them so I'm sure i have 4 like your car since they are the same :p

anywho, I replaced the fuses, put the new platinum NGK plugs and all is good. glad it was simple and didn't cost me a tow to the repair shop :)