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Discussion Starter · #1 ·
throwing p1105 and p1492 cel saw a thread on the p1105 code but still cant seem to find where the location of it is :( seems to me that my egr was removed when i got the vehicle so could that be why its throwing the p1492 code ? new to this kinda vehicle so im not to familiar with most of the stuff any help will be appriciated ! thankks
 

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If you have a 99 then the map sensor (p1105) is directly in the center of the firewall. It's mounted right under the wiper cowel on a metal bracket. If you have newer model it is on a metal bracket right by the air box and maf.

P1492 is a purge valve solenoid. These two codes together would lead me to believe you either have a bunch of cracked vac lines, someone removed the items or vac lines or possibly you have lines crossed.
 

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Discussion Starter · #4 ·
If you have a 99 then the map sensor (p1105) is directly in the center of the firewall. It's mounted right under the wiper cowel on a metal bracket. If you have newer model it is on a metal bracket right by the air box and maf.

P1492 is a purge valve solenoid. These two codes together would lead me to believe you either have a bunch of cracked vac lines, someone removed the items or vac lines or possibly you have lines crossed.
So how would i go about fixing that?
 

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So how would i go about fixing that?
Use the idx.pdf file here http://www.nicoclub.com/FSM/G20/1999_G20/1999_G20/ and go through the FSM.

You will need to make sure each of the 3 emissions solenoids behind the motor (black=egr, brown=map/boro, green=evap) are plugged in and the vacuum hoses are correctly routed to their corresponding system.

I recommend buying yourself about 4 feet of vacuum hose from an autoparts store, and cut off about 2 and a half feet. Unplug lines and blow through (the long vacuum tube you cut) on the back of the motor to understand how your lines are currently routed. Use the remaining pieces of hose to fill in cracked/missing lines. Look up each solenoid in the FSM to understand where each tube is supposed to be routed to.

Its a time consuming process, but really the only way to make sure things are correctly routed on your own (especially if you have missing lines or if someone was working on the car that shouldn't have been). The 99 g20's have the most complicated emissions systems of all of the sr20's.
 

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Discussion Starter · #6 ·
Use the idx.pdf file here http://www.nicoclub.com/FSM/G20/1999_G20/1999_G20/ and go through the FSM.

You will need to make sure each of the 3 emissions solenoids behind the motor (black=egr, brown=map/boro, green=evap) are plugged in and the vacuum hoses are correctly routed to their corresponding system.

I recommend buying yourself about 4 feet of vacuum hose from an autoparts store, and cut off about 2 and a half feet. Unplug lines and blow through (the long vacuum tube you cut) on the back of the motor to understand how your lines are currently routed. Use the remaining pieces of hose to fill in cracked/missing lines. Look up each solenoid in the FSM to understand where each tube is supposed to be routed to.

Its a time consuming process, but really the only way to make sure things are correctly routed on your own (especially if you have missing lines or if someone was working on the car that shouldn't have been). The 99 g20's have the most complicated emissions systems of all of the sr20's.
i do know that the motor that is in it is from a 96 so could that also lead to these issues as well or r they all the same besides the det im new to this kinda vehicle so im not to familiar with most of the stuff
 

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i do know that the motor that is in it is from a 96 so could that also lead to these issues as well or r they all the same besides the det im new to this kinda vehicle so im not to familiar with most of the stuff
If the motor was from a 96, and the intake manifold is flat on the top, the 99 emissions will not work properly on the motor. You need the top half intake manifold with the 2 tubes that run across the top for a 99 emissions system to work properly, it is completely necessary for the evap system to function properly.

Open your hood and look at the motor, if there are 2 larger tubes that run across the top of the intake plenium, you're good. If the top of the intake plenium is flat, then it most likely is a 96 engine and they didn't swap the 99 intake manifold over.

The vacuum hoses are still a must to check and are located in the back of the motor down towards the axles near the firewall/steering rack.
 

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Discussion Starter · #8 ·
If the motor was from a 96, and the intake manifold is flat on the top, the 99 emissions will not work properly on the motor. You need the top half intake manifold with the 2 tubes that run across the top for a 99 emissions system to work properly, it is completely necessary for the evap system to function properly.

Open your hood and look at the motor, if there are 2 larger tubes that run across the top of the intake plenium, you're good. If the top of the intake plenium is flat, then it most likely is a 96 engine and they didn't swap the 99 intake manifold over.

The vacuum hoses are still a must to check and are located in the back of the motor down towards the axles near the firewall/steering rack.
ill take a pic and post for u when i get out of work
 
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