Still having problems
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Senior User
Joined: Apr 2004
Posts: 179
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Still having problems
Ok, I'm still having problems. My 91 3 liter is still loping at idle and is hard to start. I've replaced the plugs, fuel filter, and idle air control valve. I think I need to get my fuel pressure checked, but I don't have a fuel pressure gauge. Now a question about that, since the fitting on the fuel rails is the same as a tire, and because fuel is measured in PSI, couldn't I just use a tire gauge on the fuel rail? Any ideas would be greatly appreciated, and if anyone can use an idle air control valve, let me know, since I hate to see one go to waste.
Senior User
Joined: Sep 2004
Posts: 391
Likes: 0
From: brooksville, florida
yes you can use a tire pressure gauge on that, hold it on tight and have some one crank the engine over, you should get about 40-45psi if it is much lower then your fuel pressure regulator is bad, or the fuel pump is bad. I did mine with a tire pressure gauge and it worked fine, did not even spill any fuel. Have you tried replacing the MAP sensor, if this is bad the it can cause your problems.
