Hi, my engine light comes on at random when driving a constant speed for example 55mph for awhile. I checked error codes and it flashes a 32 and 44. 32 could be EGR and 44 could be Oxy sensor. I have a 92 RS 305 TBI. Everything is now stock.

Before I replace the EGR with MAP and the Oxy sensor, I was wondering if the Oxy sensor could trigger the EGR error code? I hate to replace everything if I don't have to. I also have an oil leak that looks like its leaking behind the intake or head on the drivers side, hard to see exactly where its leaking from. Would that oil leak cause error codes too?

Thanks

 

This is what I'm getting for a code 32 and 44:


Code 32: EGR system- Restricted vacuum hose to EGR solenoid or valve; poor electrical connection, open or short in circuit; defective EGR solenoid; defective EGR valve; defective ECM

Code 44: Lean exhaust- Lean condition caused by malfunctioning carburetor/fuel injector, vacuum leak, low fuel pressure, etc.; poor electrical connection, open or short in circuit; defective MAP sensor; defective oxygen sensor; defective ECM


Don't go replacing parts yet. For the code 32, I would first check all of the vacuum lines going to and from the EGR valve and EGR solenoid. Check the electrical connections at the EGR solenoid, and check the wiring for burns, shorts, etc. If you can, apply a vacuum to the EGR valve and make sure it holds the vacuum and that the diaphragm moves. It may also help to remove the EGR valve and clean the EGR passages as good as you can, they can get clogged and really dirty over time.

For the code 44, I would check all of the vacuum lines again, and make sure you don't have any other kind of vacuum leak. Check the resistance of the injectors (should be 1 to 2 ohms) with a voltmeter. Check the fuel pressure (should be 9-13 PSI) and make sure you don't have any exhaust leaks either. Check the wiring to and from the MAP and O2 sensor, making sure that there are no burns, shorts, etc.

 

Ok, how do I check the fuel pressure? I did clean the EGR valve out a few months ago, wasn't too dirty. I also checked the vacuum line going to it and the solenoid and MAP sensor. They seem ok.

I do notice that when the engine is cold that it has trouble starting sometimes. Then when it does start it idles rough and around 500 rpms. I also notice that if I shut if off and restart the car when it does that, it idles normal at about 1000 rpms until it warms up. I am thinking it could be a faulty EGR valve.

I notice that the exhaust smells really lean and hot. Now if my intake is leaking oil out the back, would that also mean it has a vacuum leak?

It seems hard to pinpoint whats really wrong, 1 error code could be a number of things.

Thanks

 

You have a couple of options for checking fuel pressure. You can go to an auto parts store and buy a "TBI fuel pressure gauge" for about $40. It uses a special fitting that goes in between the hard fuel line and rubber fuel line so you can hook-up the fuel pressure guage, since TBI engines don't have shraeder (spelling?) valves like modern FI systems use.

You're other option is to a buy a 3/8" fuel pressure gauge T-fitting and fuel pressure gauge(should range from at least 0-15 PSI, and be liquid-filled) from a place like Summit or Jegs. But, when you go this route, you have to cut into the rubber fuel line, and the gauge and tee have to stay installed. This route is cheaper, though, at about $25

Here's a picture of my set-up, which is the second option I mentioned:


I would think so, but I'm not 100% sure on that.