Hard to start after car sits for more than 6 days
08-05-2013, 01:14 AM
#1
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Hard to start after car sits for more than 6 days
95 993 just started symptoms of hard starting after sitting and not being driven for longer than 7-10 days.
It just cranks, it seems like it is not getting fuel. No fuel smell at all while cranking.
Once it starts after cranking several times10-15 seconds it will run normal.
If I try to start it the next couple of days no problem it will start right up.
Any ideas?
It just cranks, it seems like it is not getting fuel. No fuel smell at all while cranking.
Once it starts after cranking several times10-15 seconds it will run normal.
If I try to start it the next couple of days no problem it will start right up.
Any ideas?
08-05-2013, 02:02 AM
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The battery is old but it is always on a battery tender when it sits undriven.
It cranks with plenty of gusto after sitting but if taken off the battery tender the battery will lose charge rapidly.
I was looking at replacing it this month, will try it and see if it helps.
It cranks with plenty of gusto after sitting but if taken off the battery tender the battery will lose charge rapidly.
I was looking at replacing it this month, will try it and see if it helps.
08-05-2013, 04:02 AM
#4
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Provided that the battery is truly in perfect condition and the engine doesn't need a tune-up, I'd suggest:
1) Replacing DME relay. This provides power to both the fuel pump AND the ignition (DME power).
2) Checking & maybe replacing the fuel filter if it has over 10K on it.
3) Checking for fuel pressure at the regulator with a gauge to make certain the system holds pressure when the engine is off. If not, you may need a new fuel pump check valve.
Hope this helps,
1) Replacing DME relay. This provides power to both the fuel pump AND the ignition (DME power).
2) Checking & maybe replacing the fuel filter if it has over 10K on it.
3) Checking for fuel pressure at the regulator with a gauge to make certain the system holds pressure when the engine is off. If not, you may need a new fuel pump check valve.
Hope this helps,
08-05-2013, 01:31 PM
#6
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Edit: Mine turned out to be the DME relay. It was strange behavior, intermittent and not a complete instant fail. It immediately started and has since started 20+times flawlessly including 2 starts with 7 days of sitting.
Original post: I am experiencing the same symptoms. Mine also starts fine on same day restart or next day restart, but similar - strong cranking with no start on a 6 day no start with no smell of gas. Once started (after 2 or 3 long (5 second) cranking sessions with break (15 second) inbetween)it will start and subsequently restart fine and run perfect.
I recently diy'd my sai check valve and did the rear spoiler control module mod to limit function to the console switch.
I wondered if perhaps one of those pins had come loose and had any effect.
Or if I had knocked a vacuum line loose doing the check valve (double checked the small one on back of the line to the check valve it was good).
I had no cel.
Just same symptoms as Richard. But as I read his post I realize that this is the first time since I've had my car that it has sat 6-7 days at a time since it is so hot here (104 today) and that the problem COULD have been there for a while but might just be manifesting itself now that it is sitting more.
I don't have time to check it right away, but I was going to put in my spare DME and just check my two DIY's a little bit to see if anything looked a miss but it sounds like the fuel regulator may be a suspect too. Is it easy to get to and what kind of gauge do I need to test it?
Original post: I am experiencing the same symptoms. Mine also starts fine on same day restart or next day restart, but similar - strong cranking with no start on a 6 day no start with no smell of gas. Once started (after 2 or 3 long (5 second) cranking sessions with break (15 second) inbetween)it will start and subsequently restart fine and run perfect.
I recently diy'd my sai check valve and did the rear spoiler control module mod to limit function to the console switch.
I wondered if perhaps one of those pins had come loose and had any effect.
Or if I had knocked a vacuum line loose doing the check valve (double checked the small one on back of the line to the check valve it was good).
I had no cel.
Just same symptoms as Richard. But as I read his post I realize that this is the first time since I've had my car that it has sat 6-7 days at a time since it is so hot here (104 today) and that the problem COULD have been there for a while but might just be manifesting itself now that it is sitting more.
I don't have time to check it right away, but I was going to put in my spare DME and just check my two DIY's a little bit to see if anything looked a miss but it sounds like the fuel regulator may be a suspect too. Is it easy to get to and what kind of gauge do I need to test it?
Last edited by JB 911; 09-09-2013 at 05:01 PM. Reason: Edit comment above
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08-06-2013, 10:39 AM
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I ordered a new DME but also think it is probably the fuel pump check valve as the car never fails once it starts and it has been driven recently.
Is there a DIY written for replacement of the fuel pump check valve somewhere?
Tried searching but only got 944 DIY's.
Is there a DIY written for replacement of the fuel pump check valve somewhere?
Tried searching but only got 944 DIY's.
08-08-2013, 04:24 PM
#9
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I'm curious too - anybody done this or know if it is a doable diy?
08-08-2013, 07:14 PM
#10
Rennlist Member
The fuel pump is accessible from underneath the front of the car .... an ~ square panel to the right of center is unbolted to reveal the pump - and the check valve on the discharge/pressure side.
As far as verifying the function of the check valve re hard starting following several days of no starts, gently crack open the gland nut on either side fuel rail of a cold engine: if the fuel is not under pressure, odds are good that the check valve is passing/not holding back pressure to the injectors = hard starting.
Easiest access to a fuel rail is removing the air cleaner on the right side IIRC.
As far as verifying the function of the check valve re hard starting following several days of no starts, gently crack open the gland nut on either side fuel rail of a cold engine: if the fuel is not under pressure, odds are good that the check valve is passing/not holding back pressure to the injectors = hard starting.
Easiest access to a fuel rail is removing the air cleaner on the right side IIRC.
08-08-2013, 07:51 PM
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Garth
Thanks for the informative post. I put in a new DME and it seems to have solved the problem. I took off the cover of the old DME to check it out and immediately noticed a burning electrical short smell.
I was going to resolder the joints on the circuit board but may just order another spare to have.
I am going to let the car sit for a few days and see if still starts right up.
Thanks to all for the informative posts.
Thanks for the informative post. I put in a new DME and it seems to have solved the problem. I took off the cover of the old DME to check it out and immediately noticed a burning electrical short smell.
I was going to resolder the joints on the circuit board but may just order another spare to have.
I am going to let the car sit for a few days and see if still starts right up.
Thanks to all for the informative posts.
