Pedal to the metal, slight hesitation

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Pedal to the metal, slight hesitation - ZermatSilver968 - 08-13-2009

Hi all,

Overall my 968 is running fine....starts hot or old immediately, idles fine goes till fuel cutout without any prob, but have two minor problems I would like to solve. 1) When I am in the low rev range <3000 there is an slight hesitation when I put the pedal to the metal. 2) With low driving speed, say below 70 KM (around 40 mph) the engine isn't running constantly. There is this small jitter.

Anyone experienced this before, any idea if the two are related? Since its an ROW car I can't do the engine light routine!

Dan

Pedal to the metal, slight hesitation - flash - 08-13-2009

check your distributor cap - contacts could be pitted

check your spark plugs - they might be loose

clean your MAF using MAF cleaner - do not touch the wire - do not start the engine until it is fully dry

Pedal to the metal, slight hesitation - ZermatSilver968 - 08-13-2009

Thanks! I'll start there!

Pedal to the metal, slight hesitation - Johannvb - 08-14-2009

I also had a hestitation when accelerating, but otherwise never had an issue. I replaced the following and the problem is now gone:
Distributor,
Rotor,
Plug Wires,
Plugs,
Reference mark sensor

I would replace the Distributor, Rotor, Plug Wires and plugs regardless...It doesn't cost much and it makes the car run smoother.

Good luck in finding the issue.

And f you find a MAF cleaner please tell me the name, because I can't Find any here in the Netherlands. What brand do you guys in the US use?

Pedal to the metal, slight hesitation - wmuldowney - 08-14-2009

I too had the same issue and now dont. Replaced rotor/cap.
Doing spark plugs next, just because.

What is this "reference mark sensor" you speak of?

Pedal to the metal, slight hesitation - flash - 08-14-2009

we use CRC MAF cleaner here - remove MAF, spray it on, let it dry, reinstall - minutes

Pedal to the metal, slight hesitation - DayDreamer - 08-14-2009

Work for me.. new cap,rotor and cleaned MAF... [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

Pedal to the metal, slight hesitation - ZermatSilver968 - 08-14-2009

Just a moment ago picked up the parts and replaced rotor, cap...also got new plugs. Checked before I left the shop both rotor and cap if part numbers were right....forgot to check the plugs....Ordered WR7 DTC 4 point got WR7 DCX single point. Annoying those mixups.

Tomorrow I'll pick up some MAF cleaner. Because the airfilter was partially gone I expect dirt build up on the wire too.

Might be worth checking the working ingredients of CRC MAF cleaner. If I can't find cleaner I could use the raw stuff depending what it is.

Pedal to the metal, slight hesitation - ZermatSilver968 - 08-14-2009

Update- Oke, looked around. CRC products are available in the Netherlands. What we are looking for is Kontakt Spray. There are various types, but assume non aggressive contact spray should do it.

Also found an message from Ford telling their mechanics to use Kontakt Spray or carburetor cleaner.

Pedal to the metal, slight hesitation - flash - 08-14-2009

i would not use carb cleaner - it is too strong, and could easily mess up the plastic

Pedal to the metal, slight hesitation - Johannvb - 08-14-2009

[ATTACHMENT NOT FOUND]QUOTE (wmuldowney @ Aug 14 2009, 01:38 PM) <{POST_SNAPBACK}>What is this "reference mark sensor" you speak of?

It is a sensor that sits just above the flywheel. It does something with the timing, but I am not 100% clear on it's function. All I know is if it doesn't work the engine does not run well...and sometimes not at all. It is rather expensive. It takes about half an hour and lots of swearing to install.

Pedal to the metal, slight hesitation - ZermatSilver968 - 08-14-2009

Flash, is your CRC bottle called Kontakt 60? I see about 25 different types, some also too strong. On the spark plugs, any recommendations? I have to exchange them tomorrow anyway.

Pedal to the metal, slight hesitation - flash - 08-14-2009

carb cleaner is fine on the spark plugs

MAF Sensor Cleaner is definitely not the same as their Contact Cleaner here - i have both

Pedal to the metal, slight hesitation - ZermatSilver968 - 08-14-2009

Found it! Now source it [img]style_emoticons/<#EMO_DIR#>/dry.gif[/img]

http://www.crceurope.com/csp/web/ProdDisp....ness=AUTOMOTIVE

Thanks for your patience!

Pedal to the metal, slight hesitation - flash - 08-14-2009

no worries - that's why we're here

Pedal to the metal, slight hesitation - Johannvb - 08-14-2009

[img]style_emoticons/<#EMO_DIR#>/mad.gif[/img] I can't find it for sale anywhere.

i found this website http://www.crc-sprays.nl/ but they don't list it either! I have sent them an email asking for it.

Pedal to the metal, slight hesitation - ZermatSilver968 - 08-14-2009

I'll contact these guys tomorrow:

Distributor Automotive Maintenance Products

CARLOGIC
HANDELSWEG 6
NL-2404 CD ALPHEN A/D RIJN
Nederland
Phone : 0172-24 26 22
E-mail Adres : info@carlogic.nl

They should to whom they sell their goods!

Anyway, lets take this bit offline!

Pedal to the metal, slight hesitation - ZermatSilver968 - 08-16-2009

Both sparks and cap replaced! Point 1 whereby the car slightly hesitates is solved! It picks up smoothly now and the engine note also sounds better. Point 2, little jitter almost gone.
Need to look at the MAS how much its contaminated, if at all. The plug cables which are by the look of it are 17 years old could cause current symptom but less likely. I'll follow the course easiest / cheapest so MAS cleaning first.

When you start these kind of investigations you always find your next activity. Saw during the plug swap the cam cover sweets a little bit of oil in all spark plug holes. Fortunately this fits into my planned cam chain vario guide inspection. Not sure yet if its worth the effort replacing the chain and vario guides myself. I'll revisit thoughts later.....first things first!

Pedal to the metal, slight hesitation - The_Oz - 08-16-2009

QUOTE (ZermatSilver968 @ Aug 16 2009, 01:31 AM) <{POST_SNAPBACK}>Not sure yet if its worth the effort replacing the chain and vario guides myself.

It's 'a day' labour [img]style_emoticons/<#EMO_DIR#>/wink.gif[/img]