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Old 04-16-2013, 12:46 AM   #1
02wrxej208
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Member#: 295496
Join Date: Sep 2011
Chapter/Region: South East
Location: Pensacola, Florida
Vehicle:
2002 stroked 20g bug
WRB

Default built motor driving issues

so I have a few issues after my stroker build, I am trying to track down the culprit.

when I give it ANY throttle more than like 10% it studders and jumps/backfires/runs like 10.1-11 afr's, I cannot hit more than like 2psi of boost. My motor idles at -21-18 psi. It is also idling at around 16.5 afr, going I already used my friends boost leak tester and found none. Before my car died, my temp gauge would instantly jump to the center. I replaced the oem thermostat with a gmspeed 160 degree( probably gonna go back to the stock tstat). I will also get my CEL's ran again and post the codes tomorrow. also my temp gauge on my cluster does not move, at all now.

my tuner did the base map and said my car was throwing a coolant temp sensor code, he tried turning it off then my car wouldnt start, sent my injectors into like a 7-8% duty cycle and it wouldnt turn over.

my related modifications
fp green
built 2.1l bottom end
stock heads
tgv deletes
hallman mbc
full oem engine gasket kit
agency power fuel rails
stock modified injectors( had them senting in a bag in my room for almost a year)
same 02 sensor and coil packs that were on the car
ks tech 77mm maf housing
tial 50mm bov, new
gms radiator
grimspeed 160 tstat
oem fpr
walbro 255 pump

I am trying to narrow the problem down, my friend thinks the temp sensor is bad and keeping my injectors in cold start mode. Or maybe the maf, 02 sensor, injector issues, or bad coil packs. My friend gave me his old coil packs for me to test.
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Old 04-16-2013, 06:57 AM   #2
pmugabi
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Fix (not by turning off) the CELs you have first.

Then check your map again after this, 16.5 is too lean on idle. I'm not sure what the stock MAF housing size is but if the KS Tech 77mm one is different from stock then the MAF sensor will need to be rescaled in the map.

Check that your BOV is not leaking.
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Old 04-16-2013, 12:28 PM   #3
kellygnsd
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2007 2.34LR, EFR7670
LINK G4 hybrid STi

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You need a working coolant temp sensor. It is used for all types of fueling corrections and cold start enrichment. With it out of commission it puts you in a default safety mode which probably dumps a ton of extra fuel. Fix the problem don't just cover them up. Things tend to work better that way. That is also the reason you temp gauge isn't reading most likely.
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Old 04-16-2013, 04:35 PM   #4
02wrxej208
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2002 stroked 20g bug
WRB

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Quote:
Originally Posted by kellygnsd View Post
You need a working coolant temp sensor. It is used for all types of fueling corrections and cold start enrichment. With it out of commission it puts you in a default safety mode which probably dumps a ton of extra fuel. Fix the problem don't just cover them up. Things tend to work better that way. That is also the reason you temp gauge isn't reading most likely.
Checked my codes, only have one for coolant temp sensor p0118, ordered a new one and it will be here tomorrow
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Old 04-17-2013, 10:49 PM   #5
02wrxej208
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Quote:
Originally Posted by 02wrxej208 View Post

Checked my codes, only have one for coolant temp sensor p0118, ordered a new one and it will be here tomorrow
Replaced the sensor. Reset my Ecu, car still drives like **** and still has the code
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Old 04-17-2013, 11:03 PM   #6
aboothman
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Could be a front O2 sensor issue. Unplug your MAF and see if the idle AFR mellows out.

Also check the wiring on that coolant temp sensor plug.
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Old 04-17-2013, 11:06 PM   #7
kellygnsd
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Check the connector. An open would give you this code too. If the sensor ohms good it may be a harness problem.
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Old 04-18-2013, 04:12 PM   #8
02wrxej208
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2002 stroked 20g bug
WRB

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Quote:
Originally Posted by kellygnsd View Post
Check the connector. An open would give you this code too. If the sensor ohms good it may be a harness problem.
So I just take the plug and use a voltage tester on it?
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Old 04-18-2013, 04:36 PM   #9
Strider327
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Is the car pulling timing at all under light throttle?
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Old 04-18-2013, 04:48 PM   #10
kellygnsd
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LINK G4 hybrid STi

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Check the pins on both sides of the connector. Make sure they make good contact with the pins in the other side of the connector. Measure the resistance of the ECT sensor by itself then measure the resistance through the ECT sensor with the plug hooked up. In order to do that you will need to know what pins it goes through at the bulkhead harness.
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Old 04-18-2013, 05:28 PM   #11
02wrxej208
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2002 stroked 20g bug
WRB

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Quote:
Originally Posted by Strider327 View Post
Is the car pulling timing at all under light throttle?
Quote:
Originally Posted by kellygnsd View Post
Check the pins on both sides of the connector. Make sure they make good contact with the pins in the other side of the connector. Measure the resistance of the ECT sensor by itself then measure the resistance through the ECT sensor with the plug hooked up. In order to do that you will need to know what pins it goes through at the bulkhead harness.
I need to get my tuner to log it but hes moving soon so he is hella busy

Kellygnsd, I really have no idea what that means
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Old 04-18-2013, 06:28 PM   #12
kellygnsd
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LINK G4 hybrid STi

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Quote:
Originally Posted by 02wrxej208 View Post
Kellygnsd, I really have no idea what that means
Then you need to take the car to someone who does or bite the bullet and take it to the dealer.
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Old 04-18-2013, 06:29 PM   #13
Fast_Wrx62
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What kind of maf do u have
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Old 04-18-2013, 10:14 PM   #14
02wrxej208
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2002 stroked 20g bug
WRB

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Quote:
Originally Posted by Fast_Wrx62 View Post
What kind of maf do u have
Oem maf ks tech big maf housing
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Old 04-19-2013, 06:46 PM   #15
02wrxej208
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2002 stroked 20g bug
WRB

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Quote:
Originally Posted by kellygnsd View Post

Then you need to take the car to someone who does or bite the bullet and take it to the dealer.
Fixed it, the park of the clip that holds the wires in place for the ect plug was broken so they got pushed thru and even tho the clip was on it wasnt making a connection. My car idles better but still drives like ****
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Old 04-19-2013, 10:29 PM   #16
kellygnsd
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2007 2.34LR, EFR7670
LINK G4 hybrid STi

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Quote:
Originally Posted by 02wrxej208 View Post
Fixed it, the park of the clip that holds the wires in place for the ect plug was broken so they got pushed thru and even tho the clip was on it wasnt making a connection. My car idles better but still drives like ****
Your welcome

Now you need a tune.
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Old 04-20-2013, 02:06 AM   #17
02wrxej208
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Vehicle:
2002 stroked 20g bug
WRB

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Quote:
Originally Posted by kellygnsd View Post

Your welcome

Now you need a tune.
Your first directions threw me off after a 17 hour shift it didnt occur to me that ect was my engine coolant temp sensor haha. I know how to test for resistance, I appreciate the help and advice alot
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