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I have spent many hours trying to diagnose this 93 f150 5.0. What happens is that it surges while it idles to the point it almost dies and then it can just started idling perfectly normal. It has 2 engine and 2 trans codes. Engine codes 173, 326. The truck has fresh tune up and a new IAC and I cleaned the EGR out checked it. I checked the TPS voltage and its right on. I have sprayed carb cleaner around everything. The odd thing is as soon as I unplug the vacuum line at the throttle body that goes to the charcoal canister purge solenoid it idles up and smooth and stops surging. I don’t understand why that vacuum port makes such a difference and others don’t. I tell myself the O2 is bad but i hold it at any rpm its fine. Help please
Edit: Fuel pressure is 30-35 which is good
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See if this helps. check your fuel pressure regulator.Also check your fuel filter.
http://www.justanswer.com/ford/7jkis-ford-f150-xlt-1994-ford-f150-xlt-5-0l.html
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
I have had a fuel gauge on it. Why does it idle up and smooth when I pull that certain vacuum line off the throttle body. Is it disrupting vacuum to something I dont know of?
Fuel filter is new and the regulator seems to be working correctly. Fuel pressure seems stable as it surges.
[quote=”Build#1″ post=122584]I have had a fuel gauge on it. Why does it idle up and smooth when I pull that certain vacuum line off the throttle body. Is it disrupting vacuum to something I dont know of?[/quote]
If your pulling a vacuum line it will idle up do to the vacuum leak
that was created. As for the smoothing out the computer is adding more
fuel. When you tested fuel pressure and pulled the FP regulator did
fuel pressure go up approx 10 psi? If you pull the vac line off the
FPR and cap it does the engine run better?
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