boost cut

98poop · 02-12-2010, 11:34 PM

I have a 87 i shimed the wastegate and i get some sort cut out at 5 pounds help just read how to check codes there 34 43 now what

mirage83 · 02-13-2010, 01:16 AM

Quote:

Originally Posted by 98poop

I have a 87 i shimed the wastegate and i get some sort cut out at 5 pounds help just read how to check codes there 34 43 now what

The ECU is telling you that it doesn't care for the shimmed wastegate.

Code 34
* The turbocharger pressure is abnormal.

Trouble Area

Turbocharger
Air flow meter
ECU
Intercooler system

Code 43 is something totally unrelated in all likelyhood.

* No "STA" signal to ECU until engine speed reaches 800RPM with vehicle not moving.

Trouble Area

Ignition switch circuit.
Ignition switch
ECU

Well, unrelated unless your ECU is going Tango-Uniform.

cre · 02-13-2010, 01:34 AM

Most likely you've created a boost leak. Check all of the couplers you've moved and those near them for tears and make sure they're securely fastened.

98poop · 02-13-2010, 01:58 AM

I didnt unhook anything

cre · 02-13-2010, 02:02 AM

Okay... doesn't really change what you need to do as far as diagnostics is concerned.

98poop · 02-13-2010, 02:17 AM

Is there a way to check all the can i spray starter fluid on it and c if it revs up i ran a getto intake im going to get a real one tomarrow could that b the problem

kamikazemkiii · 02-13-2010, 02:38 AM

what are your mods?

cre · 02-13-2010, 04:25 AM

If it is a boost leak, ether's only going to cause a bump in the idle if the leak is so bad that it's already affecting the idle... A boost leak can be crap to track as it doesn't actually leak until there's a good amount of pressure. Google "DIY boost leak tester" or something along those lines and you'll find instructions on building a simple test kit.

If you suspect your intake piping then check it. A leak AFTER the air flow meter is what will cause your issues, not one before it... although fuel cut at only 5psi is most likely after the turbo.

98poop · 02-13-2010, 10:37 AM

I dont have any mods on my car

Green7mgte · 02-13-2010, 07:38 PM

let me find that post. here you go. started by supralover. goes over some basic boost leak testing
http://www.toyota-supra.info/forums/mkiii-supra/16001-weird-boosting.html

and this one will really help you http://www.fd3s.net/boost_problems.html

Quote:

Originally Posted by mirage83

Well, unrelated unless your ECU is going Tango-Uniform.

lol phonetic alphabet my favorite is Wisky Tango.. (aka WT)

02-12-2010, 11:34 PM	#1
98poop Stock Join Date: Jan 2010 Location: elkhart in Posts: 24	boost cut I have a 87 i shimed the wastegate and i get some sort cut out at 5 pounds help just read how to check codes there 34 43 now what Last edited by 98poop; 02-13-2010 at 12:25 AM.

02-13-2010, 01:34 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Most likely you've created a boost leak. Check all of the couplers you've moved and those near them for tears and make sure they're securely fastened. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

02-13-2010, 02:02 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Okay... doesn't really change what you need to do as far as diagnostics is concerned. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

02-13-2010, 02:17 AM	#6
98poop Stock Join Date: Jan 2010 Location: elkhart in Posts: 24	Is there a way to check all the can i spray starter fluid on it and c if it revs up i ran a getto intake im going to get a real one tomarrow could that b the problem Last edited by 98poop; 02-13-2010 at 02:37 AM.

02-13-2010, 04:25 AM	#8
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	If it is a boost leak, ether's only going to cause a bump in the idle if the leak is so bad that it's already affecting the idle... A boost leak can be crap to track as it doesn't actually leak until there's a good amount of pressure. Google "DIY boost leak tester" or something along those lines and you'll find instructions on building a simple test kit. If you suspect your intake piping then check it. A leak AFTER the air flow meter is what will cause your issues, not one before it... although fuel cut at only 5psi is most likely after the turbo. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

02-13-2010, 01:58 AM	#4
98poop Stock Join Date: Jan 2010 Location: elkhart in Posts: 24	I didnt unhook anything

02-13-2010, 02:38 AM	#7
kamikazemkiii 3" Exhaust Join Date: Mar 2009 Location: raleigh Posts: 138	what are your mods?

02-13-2010, 10:37 AM	#9
98poop Stock Join Date: Jan 2010 Location: elkhart in Posts: 24	I dont have any mods on my car

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