Question about 2004 Isuzu Axiom
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Posted on Jan 02, 2017
SOURCE: where is the port to
There is no port to check the fuel pressure on your engine. The way Isuzu has you check it is to disconnect the line a the fuel filter and you jump the terminals at the fuel pump relay (see picture below). You run the pump collecting the fuel that comes out of the line for 15 seconds. You should have at least .38 liters (don't know the conversion to pints or whatever). Now for some bad news. In most cases on your engine with the trouble code of P1239 it is the high pressure fuel pump. You have a secondary gear driven pump located/mounted on the back of the right (passenger side) cylinder head. That is what pumps high pressure to you fuel rail which in turn goes to the fuel injectors. Through my experience on many of these engines this is your problem. Now are you ready for some even better news ? That pump cost around $1,000 at the dealer and if you want a new one that's the only place to get it. I just did one a few weeks ago and did find a used one off of a wreck but it still cost me about $500.00 and it took me 3 weeks to locate one. It can be driven this way but it is hard. I am guess the reduced power light has come on and it is hardly moving. In most cases if you kind of give it a little extra gas it will build up the pressure enough to go out of limp mode but I did not recommend that because it is very unsafe in traffic. Below is a picture of that pump for you. I hate to be the guy to give you the bad news and I hope I am wrong but own a shop and this is a common thing for the 3.5 liter engines in both the Axiom and the Rodeo but they are different pumps so you have to get the one for the Rodeo only. If you have any questions feel free to email me at email@example.com and I can help you the best that I can including giving you an idea where to get a used one if you want. Hope this helps a little and good luck.
Posted on Sep 17, 2011
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