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Discussion Starter · #1 ·
Ok so it cranks but wont start. I replaced fuel pump, fuel filter, vacuum lines,plugs, wires, ignition coil, maf sensor, and gutted the cats, 2 new o2 sensors(before cats) and still nothing. Help please.

Oh and it had codes 171 and 174 which is running lean on bank 1 and 2
 

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I’ll see if Grimbrand is around. Hang in there, help is hopefully on the way.
 

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Tech-Expert
2006 Mustang GT Deluxe a.k.a. Scarlett
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46 Posts
It sounds like you still have a fuel supply problem. Attach a pressure gauge to the Schrader valve on the injector rail and check the fuel pressure while the engine's cranking. If it's low, the cause could be any one of the following:

1. Bad fuel pressure regulator.
2. Fuel filter installed backwards.
3. Clogged fuel pump filter sock (unless it's new).
4. Faulty fuel pump (I know it's new but don't take it for granted that it's good).
 

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Just so you guys know, the OP did login and look at the replies.

Gatorwade, you should at a minimum give these guys a 👍 (thumbs-up) when checking for replies. If you don’t reply in the thread, or give them a reaction, they have no way of knowing, that you returned and read the responses.

It’s proper forum etiquette to show that you have checked-in, and appreciate the effort to provide you with help.
 
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