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View Full Version : nightmare in a 2.0L part one.



Hybrid944
08-24-2004, 03:06 AM
so the car is running fine. then i go to denver to pick up my cousin. boosting at 22+ psi all day and the car is running strong.

I fill up at a gass station in denver and BLAM. heavy hessitation at 19+ lbs.

then it gets progressivly worse.

a fitting was made for me by whistler bearing. but they used the wrong type of putty and it melted in the gas. so its now stuck in my inj's (hessitation now at 16lbs.

next day I change fitting, sparkplugs from ngk @ .33 to bosch platnums @ .35, and now car will not boost over 10lbs with out some major detonation.

I get the inj's cleaned my tracy, and it feels like its running good. untill i get on it. its still all fuckered up.

i data loged it and it was pulling timing all over the place. with 45' at 6k rpm. (I finally did get it to boost at over 5500 rpm but before that for get about it. if had the fuel from -45% to -13% and nothing ishelping.

it read in the - teens till 3200 then - twenties, then - teens again @ 45, then - late 30's till 7500 rpm. this was the SAFC fuel ratios.

now timing at this fuel was mostly low 20's with some major hesitation between 3500 and 5200 then it worked like a charm.

but still having problems.

I did fix a few vacume leaks that were probably there since the previous owner had the car, but i dont htink that will throw the entire system off. like that. errr....

about to blow up this stupid dsm.


and sugestions???

biglady112
08-24-2004, 08:57 AM
Plugs need to be at .027-.028. That is a huge gap for big boost. Fuel filter maybe. Pull your negative battery cable for a few minutes. Then pput it back on and start from scratch. This sounds tune related. Resetting the ECU will clear any codes and bring the ECU out of safety mode if its in one.
Steve

Hal
08-24-2004, 09:04 AM
Never use Platinum plugs in these cars.

It seems like every who uses them has issues.

Replace them with the NGK or Champions, gapped at no more than .028.

Hal

biglady112
08-24-2004, 09:09 AM
Hea HAL. aren't the BPR6ES-BPR8ES platinum plugs? I thought they were single pronged platinum.
Steve

biglady112
08-24-2004, 09:09 AM
Oh just answered my own question.
I know they are copper. I'm retarded
Steve

Tofu4G63
08-24-2004, 10:24 AM
Platinums are BAD for boost or NOS. My friend put some in on his completely stock Laser with just an MBC and a boost gauge. Wow....... talk about running like poo. Thing would not boost. I asked........ didnt you just do a mini tune up. He's like yeah I even went all out and got platinum plugs. Told him to spend the 3-4 bucks on the normal copper ones. Well worth it.

Hybrid944
08-24-2004, 04:02 PM
and so it goes.

this morning. I gapped the plugs at .28 and it ran pretty good.
up till 15lbs. any higher and some hesitation.

ill go pick up some ngk's on my way back home.

and reset the ECU then.

ya the fuel curves are close to where they were before and under 23+ lbs.

timing on your program HAL for timing is between 11 and 17. some times in the higher rpm bands it is close to 22. but at times its jumping to 3'

ill try this and report back. lol

mike.

Hybrid944
08-24-2004, 04:04 PM
i just remembered that i have a set of champion plugs in the tool bag.

ill set these up and run them.

Hybrid944
08-26-2004, 03:36 PM
for search purposes. this is what fixed it.

there were a few vacuum lines that blew of fof the intake.
ngk plugs were used.
and fuel was leaned out quite a bit.

runs like a champ now.

ryanman
08-26-2004, 04:15 PM
Champion plugs are the shittiest plugs you can possibly put in there. Use ONLY NGK's.

v413nc3
08-26-2004, 04:16 PM
Naw, I've seen worse plugs :) But champions are pretty crappy. I mean cmon, they sell them at KMART.

fusionsport
08-26-2004, 09:00 PM
Bosch Platinums were developed specifically for turbo cars, in my experience when people buy platinums for the 4g63 they select the wrong plug and (yes, I HAVE seen this) try to gap them like a standard plug, which most people do with those cheesy little tools sold at the parts counter. ERR yeah- this doesnt work, you damage the electrode and the plug is completely useless. I have had zero issues using Bosch Platinums in any turbo Porsche race cars.

Personally I am using Denso Iridiums and have had no issues at all. I put the same plug in a 2G and the car would barely run before it started knocking and running like crap. Put NGKs back in it and it ran perfect- no idea why one car ran so bad when another ran great-

Cyr80231
08-27-2004, 12:20 AM
Yeah, I'm Tofu's friend... the one that put platinum plugs in the stock laser(stupid idea). But anywas, don't dsm's come stock with champs.... Just get a heat range colder then stock and you'll be fine.

ryanman
08-27-2004, 09:11 AM
Nope, they come with NGK's.

Jack(IAT)
08-27-2004, 01:28 PM
We have found the Bosch Supers work pretty good too. Nice thick plug. I would also agree that champs are not very good. We had a DSM come in with champ plugs where the ceramic broke off and blocked off the electrode! That's was pretty cool.

Jack

v413nc3
08-27-2004, 01:30 PM
Better than it breaking off, leaving the engine and trashing the turbine blades :)

Jack(IAT)
08-27-2004, 01:34 PM
Doh! Had that happen too. Also did damage to my piston. Was pinging pretty bad on a set of NGKs and it just exploded.

Jack

v413nc3
08-27-2004, 01:36 PM
Sounds like a good reason to pull and inspect the insulation every 4-6 months to me.