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So here we go again. This is a 2000 Pontiac Grand Am 2.4 liter. Having problems with bank 1 too lean. (PO171) So have not done a lot on this car but to me it smells like its running rich really rich. So I have taken it to a mechanic numerous times and he can not seem to find the problem. Yesterday took it back to him for the same reason but this time he took it for a drive. He got back and said it is the fuel injectors. Could this be the problem for running too lean. PO171. Whats your guys thoughts.
So on this vehicle I have done a few things that to me were common sense. Changed fuel filter, spark plugs and the coil pack, air filter and that’s about it.
Any suggestions would really help.
Thanks
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Could be fuel. Hook up a fuel pressure gauge. should be about 50 psi.
you could also check for vacuum leaks. more in this link.http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
So changed out the fuel injectors this morning. Car seams to run fine. Took car for a spin and now can’t get it started for some reason. When I talked to my son he said it has been doing this for a while. Only happens now and then he said. Why is this happening?
Goes in on Wednesday for vacuum leak check.
Try cycling the key on and off 3-4 times without starting it to
prime the pump. Then see if it starts. You could try some starter
fluid to see if it runs.Usually my son said if you let it sit for 15 – 20 min. it will start up and all is good then but this happens at least once a day.
You wrote…Scanned. Code reads as follows PO171 (system too lean Bank 1) and also PO300 (Random/Multiple Cylinder Misfire Detected) Replaced the fuel filtre, all 4 spark plugs, and the coil pack. Not sure where else to start looking at solving this issue as its my sons car.
Hutch, you mentioned the above on a previous post. Is this a different 2.4? Did you get the misfire situation sorted out? I know you replaced the coil assembly previously with one from the salvage yard. The smell of fuel could be due to unburned fuel from the misfire. As I mentioned on the other post, the quad 4’s are bad about the catalytic converters over heating when a misfire results in unburned fuel. Hope you get it all sorted out…
Same 2.4 liter. I did get the misfire sorted out. I changed all 4 fuel injectors and no misfire anymore. Just put some sea foam motor treatment in gas tank to clean the injectors. But been having this problem from the beginning as the engine runs great now but every now and then it stalls out and then we can not get it started again for about 30 min. Once I wait the 30 min its all good again. Not sure why. Actually I have no idea why its doing this. Going in on Wednesday for a vacuum leak test but other than that i don’t even know where to start next.
Any suggestions would be greatly appreciated.
Thanks
I’d go back to College Man’s suggestion about being fuel related. The smell of fuel + starting up again after waiting a while sounds like it might be getting flooded.
Maybe i will check the fuel pressure tomorrow. Not sure where is the main line i connect to test the pressure to see if I am getting 50 PSI.
Thanks
Where is the air/oil seperater for PCV. Was thinking this could be part of the problem. Need to know where the location is and how to clean it?
Could this cause the problem? Thought maybe the PCV Valve but I don’t think the 2.4 liters have a PCV Valve please correct me if I am wrong.
Thanks
96 through 2002 quad 4’s utilizes an air oil separator. It is mounted to the block above the oil filter. This doesn’t caused a misfire as you previously described. You can clean it though to see if idle, etc. improves.
I understand it has nothing to do with misfire as I have the misfire part solved. I am having issues with the car stalling out every then and again. This is why I was thinking maybe the air oil separator has something to do with it. Was cleaning out the air filter and noticed there was oil all through the housing.Maybe so corrodide with oil that its not getting enough air possibly.
I was also reading the a common problem on these 2.4 liters is that the vacuum hose from the MAP sensor cracks. Any pictures that I look at don’t really make any sense to me. Can someone explain where this vacuum hose is.
Thanks
So guys I just want to take some time and thank everyone that helped me out with this issue as I now have the problem solved. In the end it was the manifold gasket. When I replaced it it didn’t look to bad at all but when I smoked tested it is was leaking between 2 and 3. Also did the vacuum test like I said earlier in this post and the vacuum all checked out good. Car runs good and my son is happy that we got this problem solved.
Again thank you everyone that helped out.
Hutch74
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