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Old 12-01-2012, 07:10 PM   #1 (permalink)
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Default Recurring hesitation problem.

I have been posting on this forum with this problem for over two years with this problem.
In that time I have cleaned or changed:-
air filter
Plugs, wires and distributor module
fuel filter
PVC valve
Cleaned IAC and Air flow sensors.
I think that's it...
The problem seems greatly improved each time I perform some operation, but not quite completely fixed.
Recently put it into the shop with another problem where the car wanted to stall in gear and stopped in traffic - turned out it was the PVC valve and they tell us they can't find the hesitation problem either.
Any further ideas would be appreciated.
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Old 12-01-2012, 07:49 PM   #2 (permalink)
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More info please. Year and engine. When exactly do you have hesitation (from a stop, from cruise, from coasting closed throttle, etc). Is it above a certain RPM range? Check engine light ever on? Fuel trim info if you have it?
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Old 12-01-2012, 08:28 PM   #3 (permalink)
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Check your vacuum lines, one at a time, for dry rot and/or cracks and pinholes. Also check the vacuum storage tanks buried inside the outer front fenders. That's a general possible cause for hesitation, rough idle and stalling - certainly not the only cause, but worth doing as preventive maintenance at the very least. I started out checking each of mine, then just decided to systematically replace the lines with all new hose and tubing. Each one I track down and replace results in smoother idle.
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Old 12-01-2012, 09:35 PM   #4 (permalink)
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Quote:
Originally Posted by behlinla View Post
More info please. Year and engine. When exactly do you have hesitation (from a stop, from cruise, from coasting closed throttle, etc). Is it above a certain RPM range? Check engine light ever on? Fuel trim info if you have it?
'03 3.0L, not duratec. Problem happens after stopping in traffic in idle. Problem caused check engine light to come on but reset after replacing PVC valve.
If I push the gas pedal hard, that is when the hesitation is most noticeable.
Thanks.
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Old 12-01-2012, 10:00 PM   #5 (permalink)
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Check engine light isn't on? Did you just clear the codes? They could still be there. What were the codes? Does the CEL flash when you have this hesitation?
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Old 12-01-2012, 10:04 PM   #6 (permalink)
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2003 OHV engine. Got it.

I would start by checking the fuel pressure. You'll have to do this with a scan tool. Check the pressure at idle, at 2000 RPM (or while driving), and monitor it while doing a throttle snap. Fuel pressure should appear to remain the same level on the scan tool. Now remove the vacuum hose from the fuel pressure sensor and repeat the throttle snap test. Fuel pressure should not drop significantly.

How long ago was PCV valve changed and codes reset?

Last edited by behlinla; 12-02-2012 at 07:49 AM. Reason: No fuel Schrader valve on your car (thanks Jeff)
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Old 12-02-2012, 12:10 AM   #7 (permalink)
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Originally Posted by Breeves002 View Post
Check engine light isn't on? Did you just clear the codes? They could still be there. What were the codes? Does the CEL flash when you have this hesitation?
The repair shop must have cleared the codes and I don't know what they were - the missus picked the car up - she mentioned something about fuel mixture.
Not sure about the CEL flashing - wife didn't mention it.
Sorry I couldn't be more helpful.
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Old 12-02-2012, 07:35 AM   #8 (permalink)
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03 is a returnless fuel system, and there is no schraeder valve on the rail for checking fuel press with a gauge. You need a scan tool to get pressure reading from the rail press / temp sensor. That is if you believe the sensor reading!
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Old 12-02-2012, 10:21 AM   #9 (permalink)
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Quote:
Originally Posted by behlinla View Post
2003 OHV engine. Got it.

I would start by checking the fuel pressure. You'll have to do this with a scan tool. Check the pressure at idle, at 2000 RPM (or while driving), and monitor it while doing a throttle snap. Fuel pressure should appear to remain the same level on the scan tool. Now remove the vacuum hose from the fuel pressure sensor and repeat the throttle snap test. Fuel pressure should not drop significantly.

How long ago was PCV valve changed and codes reset?
PCV replaced and CEL reset was 1 week ago.
Thnx.
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