Help with P0304
Professional
Joined: Nov 2007
Posts: 162
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I hate to say it, but the mechanics at that dealership are idiots, that is the FIRST thing I check on fords. For some reason, every other manufacturer has put in some kind of management for a vacuum leak. Ford has not. Take my 95 1500 and pull a large vacuum line. Do it on any older Vacuum Distributor engine, any Chevy. It will automatically idle at a much higher speed to compensate for the leak.
Fords on the the other hand, will loose idle speed as they try to stay running with the vacuum leak, mis-firing the whole time, and sounding like general crap. The lager the leak the lower the idle. You can make a 2.3l 4cyl ranger sound like a MASSIVE CAM V8 simply by pulling a vacuum line or two.
9/10 on a ford IME, it is a PCV valve grommet that has lost its flexibility and allows air to leak by the valve in rather mass quantities. So far off the top of my head, I have fixed a Ranger, a Crown Vic, a Bronco, an Explorer, and as escort simply by finding the PCV valve and wiggling it in its grommet, if its loose enough that you can take it out without pulling with hardly any force, it needs to be replaced.
But now, you know!
Fords on the the other hand, will loose idle speed as they try to stay running with the vacuum leak, mis-firing the whole time, and sounding like general crap. The lager the leak the lower the idle. You can make a 2.3l 4cyl ranger sound like a MASSIVE CAM V8 simply by pulling a vacuum line or two.
9/10 on a ford IME, it is a PCV valve grommet that has lost its flexibility and allows air to leak by the valve in rather mass quantities. So far off the top of my head, I have fixed a Ranger, a Crown Vic, a Bronco, an Explorer, and as escort simply by finding the PCV valve and wiggling it in its grommet, if its loose enough that you can take it out without pulling with hardly any force, it needs to be replaced.
But now, you know!
My favorite part though was the service rep telling me that it was because I didn't use Motorcraft spark plugs. Like only Motorcraft plugs would work in Fords. I think I used Bosch, it's been a good 5 years, but I remember buying good plugs, not cheapies.
Thread Starter
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Registered User
Joined: May 2010
Posts: 4
Likes: 0
Sooooooo....I did a vacuum test and didnt find any problems there. Today I went ahead and did a compression test with these results
#1-120
#2-110
#3-116
#4-98
#5-120
#6-125
Are these results indicative of a burnt valve???
#1-120
#2-110
#3-116
#4-98
#5-120
#6-125
Are these results indicative of a burnt valve???