S-10 EGR replaced now lopes
cluelessart
10-23-2006, 08:32 AM
I recently had a code 42 (my EGR valve) on my 92 s-10 Blazer "W" engine and found it to be stuck in the out (closed position I think) and freed it up. I replaced the EGR in the vehicle and buttoned it up. I now have a code 45 (O2 sensor shows too rich a mixture). By the way it won't idle either
Any ideas?
Any ideas?
sreve
10-23-2006, 06:03 PM
42 is not a n egr code. there are differnt egr valves some use back pressure some don't. some after market ones are shimed. put your old one back on-see if the lope goes away. 42 is an electronic spark control code.
cluelessart
10-24-2006, 12:31 AM
Sorry, It was a 32 code and now I have a 45. The top air intake has to come off and I didn't change the gasket. Would getting too much air or not pulling enough vacuum cause the problem I now have?
The engine won't run at idle and after it stalls it is difficult to start. I have to put my foot to the floor to get it started the second time.
The problem started at hot and after I had just filled it up with gas. Initially I thought I might have gotten bad gas because it had run great until that point. I recently would get a check engine light occasionally after I would step on it.
Since I had to take the top off I thought I might have missed a connection or crimped a vacuum hose. I'll check as long as I have to take it apart again.
The engine won't run at idle and after it stalls it is difficult to start. I have to put my foot to the floor to get it started the second time.
The problem started at hot and after I had just filled it up with gas. Initially I thought I might have gotten bad gas because it had run great until that point. I recently would get a check engine light occasionally after I would step on it.
Since I had to take the top off I thought I might have missed a connection or crimped a vacuum hose. I'll check as long as I have to take it apart again.
blazes9395
10-24-2006, 01:20 PM
42 is not a n egr code. there are differnt egr valves some use back pressure some don't. some after market ones are shimed. put your old one back on-see if the lope goes away. 42 is an electronic spark control code.
This is a 'w' engine, CPI injection, it has a linear EGR, it is directly controled by the ECM/PCM, no vacuum in this setup.
If you took off the upper intake, and didn't install it properly, eg. broke the gasket between upper and lower intake, it will idle bad.
But since you mention you have a rich system, did you take a good look at the CPI injector/fuel lines/regulator for any leaking? Very common problem and will cause flooding and extremely poor performance. Do a search on here about CPI problems.
This is a 'w' engine, CPI injection, it has a linear EGR, it is directly controled by the ECM/PCM, no vacuum in this setup.
If you took off the upper intake, and didn't install it properly, eg. broke the gasket between upper and lower intake, it will idle bad.
But since you mention you have a rich system, did you take a good look at the CPI injector/fuel lines/regulator for any leaking? Very common problem and will cause flooding and extremely poor performance. Do a search on here about CPI problems.
Chris Stewart
10-30-2006, 02:52 AM
Hi Gang,
The #45 Trouble code is : O2 Sensor sensing rich condition.
That's trouble inside the intake plenum and it'll have to be opened...not bad, just remove the intake air ductwork including the rubber piece on the throttle, the Vortec emblem on top, the 10 10mm bolts/studs holding the top on, unplug the electrical connectors, disconnect the vacuum hose at the rear/passenger side and the power brake hose.
Gently roll the top over to the left so you can keep the cables connected.
Now the meat an' taters to this...it's supposed to be greasy & grungy looking inside there. Whichever side has a real clean area is where there's a fuel leak.
If there's a clean spot on the drivers side, you'll need to replace the fuel lines. If it's on the passenger side, the fuel pressure regulator mounted on the fuel injection unit is bad.
The good news is the parts are available wherever you see those HELP parts displays at most auto parts stores.
More info coming...
Found it, click below. A big thanks to Rilth!!!
http://www.automotiveforums.com/vbulletin/showthread.php?t=518850
The #45 Trouble code is : O2 Sensor sensing rich condition.
That's trouble inside the intake plenum and it'll have to be opened...not bad, just remove the intake air ductwork including the rubber piece on the throttle, the Vortec emblem on top, the 10 10mm bolts/studs holding the top on, unplug the electrical connectors, disconnect the vacuum hose at the rear/passenger side and the power brake hose.
Gently roll the top over to the left so you can keep the cables connected.
Now the meat an' taters to this...it's supposed to be greasy & grungy looking inside there. Whichever side has a real clean area is where there's a fuel leak.
If there's a clean spot on the drivers side, you'll need to replace the fuel lines. If it's on the passenger side, the fuel pressure regulator mounted on the fuel injection unit is bad.
The good news is the parts are available wherever you see those HELP parts displays at most auto parts stores.
More info coming...
Found it, click below. A big thanks to Rilth!!!
http://www.automotiveforums.com/vbulletin/showthread.php?t=518850
Automotive Network, Inc., Copyright ©2025