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crankshaft position sensor, fuel pump??? HELP!!!!

 
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Old 20 Jan 2011, 02:35 am
Amy Amy is offline
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Default crankshaft position sensor, fuel pump??? HELP!!!!

My 2005 Touring PT 66k miles has been shuddering (like a losing power feeling) while idling or at very low speeds for about a month. It has even stalled a few times. It is showing no error codes. Just had a tune-up, oil change, and 60k mile maintenance done 2 weeks ago...problem still persisits. I got a fuel injection cleaning last week and it drove great for two days and the problem is back but is now intermitent. I took it to the mechanic today and he couldn't figure it out. He hooked it up to the computer just in case it was storing any codes and it wasn't. My mechanic thinks it may be either a failing crankshaft position sensor or a failing fuel pump. I have had to replace the camshaft position sensor twice in the past 18 months, not sure if this is related.
Please help! I was thinking about just replacing the crankshaft position sensor because it is much cheaper than the fuel pump, but I don't want to be replacing parts that don't need replacing. Any advice would be awesome! Thanks.
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Old 20 Jan 2011, 02:56 am
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Default Re: crankshaft position sensor, fuel pump??? HELP!!!!

Does the tach drop coincidence with stuttering?
You can log the tach (crank sensor) signal on an OBD scanner.

You can put a gauge on the fuel rail, drive around with it and see if there's an
issue.

The crank position sensors are total fun, the outboard bore rusts and the o-ring
doesn't wish to go over it. EZ to break.

Seems if were either of these items, the problem would occur at all engine speeds.

Perhaps the EGR is being over-exuberant or something.
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Old 20 Jan 2011, 03:23 am
Amy Amy is offline
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Default Re: crankshaft position sensor, fuel pump??? HELP!!!!

I forgot to mention my PT also sometimes hesitates when accelerating. It usually does this when I am just taking off from an idle. But it has done this once a few days ago as I was merging on the freeway at about 40 mph.
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Old 20 Jan 2011, 04:00 am
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Default Re: crankshaft position sensor, fuel pump??? HELP!!!!

Did tune up include plugs and wires?
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Old 20 Jan 2011, 08:38 am
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Default Re: crankshaft position sensor, fuel pump??? HELP!!!!

Quote:
Originally Posted by murphy View Post
Did tune up include plugs and wires?
If so, was something other than stock wires used? What spark gap was used, most here use .040?
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Old 20 Jan 2011, 11:39 am
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Default Re: crankshaft position sensor, fuel pump??? HELP!!!!

you need to start with the basic's, the fact that no error codes are thrown merely means the motor is not generating any emissions concerns at the moment to flag the check engine light. i know there is more substantially more detail to the check engine light but trust me, for you the motor is not running lean or rich else the engine light would be on.

1) start with spark, do you have good clean spark at all plugs?
2) Do you have good fuel pressure?
3) Do you have fuel at each injector?
4) Have you checked and confirmed no vacuum leaks?
5) Have you checked and confirmem no coolant losses?

Do these basic steps, I know they take time but done well will go along way to diagnosing the problem and pin pointing the failure. Let us know what you find.
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Old 21 Jan 2011, 09:31 pm
Amy Amy is offline
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Question Re: crankshaft position sensor, fuel pump??? HELP!!!!

Thank you for all your advice. I am taking it to the mechanic in the morning to have the fuel pressure checked. And I called the mechanic that did my tune-up last month and asked if he replaced the spark wires when he did the spark plugs....and he did not.
While driving tonight and on a slight incline on the freeway, my PT started to jerk as if it were going to die right there at 50 mph. Only did that 2 times and then ran as it lately does (which is generally great unless idling). I will keep you posted.
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Old 21 Jan 2011, 09:35 pm
Amy Amy is offline
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Question Re: crankshaft position sensor, fuel pump??? HELP!!!!

Quote:
Originally Posted by UptownSport View Post
Does the tach drop coincidence with stuttering?
You can log the tach (crank sensor) signal on an OBD scanner.

You can put a gauge on the fuel rail, drive around with it and see if there's an
issue.

The crank position sensors are total fun, the outboard bore rusts and the o-ring
doesn't wish to go over it. EZ to break.

Seems if were either of these items, the problem would occur at all engine speeds.

Perhaps the EGR is being over-exuberant or something.
How do I log the tach (crank sensor)?
What is the EGR??????
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Old 22 Jan 2011, 04:54 am
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Default Re: crankshaft position sensor, fuel pump??? HELP!!!!

Get a OBD reader to log the crank signal.

Autozone, etc will usually loan them out.

The EGR is a pipe that runs from the exhaust to the intake manifold.
If it's getting too much exhaust gas, it'll run poorly. The valve will
need to be cleaned/replaced.

There's many things that could and will cause poor performance.
The plug wires certainly would be a suspect.
Intermittent problems are difficult to find; it will always work fine when the mechanic's looking at it.
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Old 23 Jan 2011, 03:47 am
Amy Amy is offline
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Thumbs up Re: crankshaft position sensor, fuel pump??? HELP!!!!

So my PT was finally fixed today!!!! The mechanic tested the fuel pump and said it tested perfectly, so he tested the crankshaft sensor which tested quite poorly. He changed the crankshaft sensor and the wires. My PT is happy again and running like a champ Thank to you all for the way cool advice! This site rules!
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