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Won't Idle

beaner

Well-known member
Joined
Jun 22, 2005
Messages
1,562
Location
b'ham, mi
I've been spending fall and winter rebuilding the engine in my 92tsi. I just got it back together and it won't hold idle. Basically it starts, revs up to 2500-3000, then just dies about 2-3 seconds in.

6 bolt 2.0 8.5:1
hks 272s
evo 560cc injectors
93oct @ 37psi
virgin 2g maf
stock tb/manifold
new bosch o2 sensor
isc is good
tb and throttle closed switch is adjusted perfectly

I've played with 180'ing the cas and swapping the plug wires. I've also played with the BISS. It's 2 full turns out right now, but nothing changes when I mess with it either way.

Thanks for any help.


click
 

524of1000

Well-known member
Joined
Oct 15, 2008
Messages
574
Location
San Antonio, Tx
Sounds like it's too lean. Check for an intake leak, make sure all couplers are on correctly, that the trottle plate is closing properly, the TB bolts are torqued down, ect. I had a similar problem, it was sucking in air between the TB and Intake Mani because it wasn't torqued properly.
 

Can you hold it in an idle? What does it sound like when it idles? I would not say that this a fuel issue, because if you are too lean to where it dies your car will not start. Have you tested your TPS? and your gounding switch?
 

beaner

Well-known member
Joined
Jun 22, 2005
Messages
1,562
Location
b'ham, mi
When the RPMs fall, I can keep the car alive with my right foot. I was afraid to do this though cause I know something isn't right and there's way too much time and money into this setup. I adjusted the TPS forever ago with an ohm meter, then when I installed DSMLink the TPS logged from 0 to 100 perfectly. I didn't test the closed throttle sensor, but I adjusted the TB cable and that sensor perfectly according to my eyeball.
 

Lonewolf64

Well-known member
Joined
May 17, 2006
Messages
1,197
Location
Birmingham, Alabama
From your OP I can't tell if you've actually gone through the proper base idle set procedure. You should definitely do this if you haven't. You should also get out your multi-meter and check your closed throttle switch to see if it works. If neither of those things help and you are sure that your ISC works, I would try swapping out to a known working CAS.
 

beaner

Well-known member
Joined
Jun 22, 2005
Messages
1,562
Location
b'ham, mi
I'll test the closed throttle switch tonight.

I already tried swapping the CAS from my gvr4, which runs fine. The CAS in the log is the gvr4 CAS. So it for sure works.
 

Adorsey

Well-known member
Joined
Apr 22, 2009
Messages
355
Location
mass
You can simulate Closed throttle switch on dsmlink.
It could be in the wiring, after the connection at the tb is made.
 

aaron619

Member
Joined
Dec 23, 2010
Messages
20
Location
Pawtucket, RI
What your describing sounds like an intake/boost leak. If the car will run off idle, and the TPS, CAS, and closed throttle work. Do you have a boost/vaccum gauge installed in the car? If you can get it to idle, even if high, with closed throttle you should have around 20"hg on your gage (with stock cams). If not, I would start looking for a big vaccum leak- brake booster, intake manifold, ect. If you do have good vaccum, look for a leak between the MAF and the turbo inlet, that's assuming it is working as designed. My 2 cents
 
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