Hard to start when warm

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01 Jun 2012 16:25 #9390 by Pauls 86.5
Hi all,
This problem has been getting a little worse every time I try to start when the car gets warm. In the morning it starts fairly quick but the idle is up and down for a few minutes then evens out but does have a little miss to it.then I drve for a short time , shut it off to go shopping and then the only way it will start is if I hold the pedal to the floor and after 5-10 seconds it will start. So I haven't changed anything yet since I bought it about 5 months ago and am not really sure where to start so any advise would be greatly appreciated.

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01 Jun 2012 16:28 #9391 by srshaw3
Replied by srshaw3 on topic Hard to start when warm
If I am going to keep a car, and have no idea of when it has been tuned up, I will start by doing one.

Changing dist caps, dist rotors and spark plugs may or may not address this issue, but there isn't much downside to changing them if it isn't known they were change recently.

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01 Jun 2012 16:50 #9392 by Pauls 86.5
Replied by Pauls 86.5 on topic Hard to start when warm
I did order new Bosch plugs, any ideas On a good place to get the rest ??

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01 Jun 2012 17:17 #9394 by srshaw3
Replied by srshaw3 on topic Hard to start when warm
Best is relative :)
The 928 vendors are likely to be able to answer questions too, so you may want to pick from one of them, depending on where you live, their locations might matter (in alphanumeric order):
928gt.com NC
928intl.com CA
928srus.com TX

If you shop prices, some of all of them, might be willing to match what you find, or explain why their offering is worth the extra money.

Good luck!

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01 Jun 2012 17:33 #9395 by Pauls 86.5
Replied by Pauls 86.5 on topic Hard to start when warm
Thanks for the info

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02 Jun 2012 14:34 #9402 by 928mac
Replied by 928mac on topic Hard to start when warm
Hard starting warm may mean that it is not getting enough air or its getting to much fuel. It may mean that the injectors are leaking a little and you have to crank it over to clear it out.
But it could also be spark as the hotter the wires, plugs and coil the less efficient they are.
So like Stan said you can do an electrical tune up and replace plugs wires and cap and eliminate that but I thing the total cost will make you sputter.

Dose it start easier when warm if you open the throttle to let some air in?

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02 Jun 2012 18:02 #9406 by Pauls 86.5
Replied by Pauls 86.5 on topic Hard to start when warm
Hi Brad, it will start if I push the pedal to the floor,its hard to start if I drive it for 10 minutes or two hours , as soon as it warms up a little that's the only way I can get it to start. And this problem started a little at a time .

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02 Jun 2012 18:10 #9409 by 928mac
Replied by 928mac on topic Hard to start when warm

Hi Brad, it will start if I push the pedal to the floor,its hard to start if I drive it for 10 minutes or two hours , as soon as it warms up a little that's the only way I can get it to start. And this problem started a little at a time .


Do you have a multimeter so that you can test the temp sensors.
There are a few step by step on how to check them, maybe even in our tech or tips section. Are you comfortable with using a meter?

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02 Jun 2012 18:42 #9410 by Pauls 86.5
Replied by Pauls 86.5 on topic Hard to start when warm
Yes I have a little experience using one, just don't no the step to checking them and where it's located

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03 Jun 2012 12:49 #9419 by 928mac
Replied by 928mac on topic Hard to start when warm
Paul, I looked in our technical libary and I found this in under 5 min

members.rennlist.org/pirtle/zcool_temp_sensors.txt

at the end of the instruction Kurt say this

(quote)

You can check the connection to the sensor by disconnecting both main plugs
to the brain in the passenger side footwell and measure the resistance
between PIN 13 to ground (PIN 17) of the LH connector. You should get
around 2 kOhms for engine cold and 200 Ohms for engine warm. While
measuring, get someone to wiggle the cables around the connectors a bit and
check that the resistance doesn't change (otherwise you have contact
problems)

The pin numbering starts with 1 where the cable enters the connector and
the row with the 18 pins (vs 17 on the other side) is the one Pin 1 - 18
so it's:

1 2 3 ... 18
cable ->
19 20 21 ... 35

(end Quote)

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03 Jun 2012 15:19 #9425 by smtcapecod
Replied by smtcapecod on topic Hard to start when warm
My money is on idle control valve.

Although that is more of a too-lean, rather than too-rich theory.

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03 Jun 2012 19:22 #9431 by Pauls 86.5
Replied by Pauls 86.5 on topic Hard to start when warm
Thanks for the extra help guys !!!! As soon as I rest up from my angioplasty I had 3 days ago :-( ...I will begin my search

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03 Jun 2012 21:19 #9432 by pcar928fan
Replied by pcar928fan on topic Hard to start when warm
Paul,

Glad you are still with us! That is no surgery to sneeze at though it is becoming downright routine these days.

Get well first then get the car running and let us know what the deal ends up being...always helpful for the next person with the same problem!

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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04 Jun 2012 20:32 #9450 by Pauls 86.5
Replied by Pauls 86.5 on topic Hard to start when warm
Thanks James !! And I defiantly will report back on what I find.

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