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2005 Mitsubishi Montero service engine light soon

Tiny
NOOB78
  • MEMBER
  • 2005 MITSUBISHI MONTERO
  • 3.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
My service engine light came on and I took it to an independent shop who informed me that I needed to replace my egr valve gasket and my upper intake gaskets. I replaced the egr gasket and the upper and lower intake gaskets figured I would do the lower since I am changing the upper. I did not have a scanner so I disconnected the battery while changing all the gaskets. I drove the Montero for 2 days and the check engine light came back on and took it to o'reilly and got it scan and the same code came up P071 and p0174 (bank 1 to lean and bank 2 to lean) I just don't know what else to do to the monty to get rid of that dreaded light.
your help would be much appreciated.

thanks
chuck cavan
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Saturday, September 26th, 2015 AT 4:00 AM

17 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge a local pro will need to do it as it requires an adapter. Shold be 38 psi at idle.
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Saturday, September 26th, 2015 AT 6:19 AM
Tiny
NOOB78
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  • 12 POSTS
Thank you I will try that and let you know today
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Saturday, September 26th, 2015 AT 6:31 AM
Tiny
NOOB78
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Hmac300 I forgot to mention that my skid control light also comes on and so does the off light with the service engine light
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Sunday, September 27th, 2015 AT 2:49 PM
Tiny
HMAC300
  • MECHANIC
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Hae it scanned for codes as well you probably have an abs problem that is knocking off your skid control
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Monday, September 28th, 2015 AT 5:38 AM
Tiny
NOOB78
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  • 12 POSTS
Got it scanned and bank 1 and 2 are lean and had it reset came back on again when I left the parking lot of o'eilly auto parts parking lot
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Monday, September 28th, 2015 AT 5:40 AM
Tiny
HMAC300
  • MECHANIC
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In my first reply I said to check fuel pressure which will cause the lean condition and in second reply I said to have a local pro scan for an abs problem for the other problem as and auto parts store can't check your other problem.S
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Monday, September 28th, 2015 AT 7:27 AM
Tiny
NOOB78
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  • 12 POSTS
I have an appointment tomorrow to get it check and will post the results tomorow
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Monday, September 28th, 2015 AT 7:28 AM
Tiny
NOOB78
  • MEMBER
  • 12 POSTS
Took to shop, got tested and came up with the codes of P0171 and P0174 they did further testing and 3 possible thing fuel regulator, fuel pump. The informed me that they couldn't do the fuel pressure test apparently who ever own the Montero before me spliced the fuel line leading from the fire wall into the fuel rail so they are going to find out how much the parts are for that and how much to replace it and then test it so going to wait for next pay period to get it done since I only budgeted myself for the scanning.

Chuck cavan
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Tuesday, September 29th, 2015 AT 8:38 AM
Tiny
NOOB78
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Ok get pressure readying 30psi, when we took the vac. Hose off the fuel pressure regulater it went up to 35 psi
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Saturday, October 3rd, 2015 AT 2:21 PM
Tiny
HMAC300
  • MECHANIC
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I gave the spec in first reply for fuel pressure and yours is to low, that will cause the 171 and 174 code. So it' s probably fuel pump if mechanic tested for regulator already.
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Saturday, October 3rd, 2015 AT 3:34 PM
Tiny
NOOB78
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  • 12 POSTS
My neighbor and I tested it since the shop refused to do it fue to the line being spliced. Going to save some money to ored one from rockauto
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Saturday, October 3rd, 2015 AT 4:33 PM
Tiny
NOOB78
  • MEMBER
  • 12 POSTS
Hmac300 thank you for your help I also have a question for you since this is a in tank fuel pump do I need to buy the whole assambly or can I just buy the pump and replace that I looked at rockauto and denso pumps with a strainer I wasn't sure if I can do that instead of buying whole thing.

Thanks.
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Saturday, October 3rd, 2015 AT 7:31 PM
Tiny
HMAC300
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Get the denso pump and strainer don't get the other brands unless it is delco or ac
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Sunday, October 4th, 2015 AT 8:11 AM
Tiny
NOOB78
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Thank you I see that rockauto has one for 80.00 that comes with a strsiner and all the clips and wearing will order that today
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Sunday, October 4th, 2015 AT 8:22 AM
Tiny
NOOB78
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  • 12 POSTS
Hmac300 well we replaced the fuel pump tonight and afterword's we tested the pressure and we got a reading of 35 to 36 psi does it take time to get up to pressure at idle? We drove it around a couple of blocks and the idle seems fine and no I am at a lost to how come the pressure didn't get up to 38 or more since its now I don't know if I would need to change the fuel pressure regulator as well
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Tuesday, October 6th, 2015 AT 6:38 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Dsconnect vacuum line and block it, if it rises to 47-50 psi it should be ok. Also rev engine several times with vacuum connected and see if it stays at 35 or so if it does don't worry about it. The spec is approximately 38 psi. So try that first.
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Wednesday, October 7th, 2015 AT 6:49 AM
Tiny
NOOB78
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Well I end up replacing the fuel pressure regulator and seems to do the trick I now have a brand new car with all the things I replaced on it thank you for your help
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Monday, October 12th, 2015 AT 6:42 PM

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