993 won't start, was working before oil change - already tried DME.
04-15-2018, 12:45 PM
#1
Racer
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993 won't start, was working before oil change - already tried DME.
Hello! It has been awhile on here but anyways the car has been working great. I decided to do an oil change yesterday, drove it around once, then parked it. Today it wont start. All I hear is the starter go on when I turn the key. I did hear a popping sound in the engine area after while it was trying to started... I did the bypass with a jumper at the DME, and I heard the fuel pump humming. Only thing different with this oil change is i pulled the DME first before i started the car to build pressure/fill oil filters.. Any ideas? I pored about 9.5 quartes of mobile 1 20w-50 in there so far, was waiting to pour the last quart.
04-15-2018, 03:05 PM
#3
Rennlist Member
Doesn't the DME do ignition as well as fuel pump? I'm not sure bypassing the DME and hearing the fuel pump whirr is proof the DME is good.
Easy enough to open up and inspect solder joints for cracks. It's the most likely cause seeing as you pulled it and replugged. There's a lot of stress on those contacts.
Easy enough to open up and inspect solder joints for cracks. It's the most likely cause seeing as you pulled it and replugged. There's a lot of stress on those contacts.
04-15-2018, 03:15 PM
#4
Racer
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Ya I took apart the DME relay and check for issues. It looked like someone repaired it before.
FIXED. Thanks p-daddy, I can’t believe I didn’t check the battery. It was 11.99 volts, no wonder it wouldn’t turn over. The car started right up. I really thought I broke something enginewise, thanks goodness. Alternator is charging at 13.89 at 800rpms. So I’ll look into the battery more.
Thanks again both of you. I will now renew my renlist subscription lol.
FIXED. Thanks p-daddy, I can’t believe I didn’t check the battery. It was 11.99 volts, no wonder it wouldn’t turn over. The car started right up. I really thought I broke something enginewise, thanks goodness. Alternator is charging at 13.89 at 800rpms. So I’ll look into the battery more.
Thanks again both of you. I will now renew my renlist subscription lol.
04-15-2018, 03:46 PM
#5
RL Community Team
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Did you inadvertently leave the frunk or engine lid ajar or bump a dome lite causing your battery to run down?
04-15-2018, 04:12 PM
#7
Racer
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It is very possible, I will charge it back up and go from there. I know if i dont drive the car for 14 - 20 days the battery will get really low and wont start. Last year I traced what was drawing to much from the battery and it turned out to be one of the gauges I believe. Never have I got around to fixed it, this may be causing excessive ware on the battery. We will see. I am just glad my car turns on!
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04-15-2018, 04:49 PM
#8
New member but long-time lurker as I am getting ready to jump back in to a 993 as soon as I can find the right car. I had purchased a few new and vividly recalling the dealer telling me to never leave the key in ignition after shutting it down - always pull it out if it’s going to sit “for a while” as it would leave a few circuits energized and pull the battery down. I think they referenced the airbags and gauges but am admittedly digging deep into the recesses of my dusty memories 
04-16-2018, 04:34 AM
#11
Not this time as per what is already mentioned above!
But: Is the battery more than 5-7 years it must be changed now! And that includes Your battery as well if You are reading this! Or You will be stranded at night at an unmanned gas station or similar!
Take My advice!
But: Is the battery more than 5-7 years it must be changed now! And that includes Your battery as well if You are reading this! Or You will be stranded at night at an unmanned gas station or similar!
Take My advice!
04-16-2018, 11:29 AM
#12
Three Wheelin'
I followed Steve's advice here and added it to my 993 spec cheat sheet. I keep a printed copy in my toolbox and check the voltage yearly.
04-17-2018, 08:26 AM
#13
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Not this time as per what is already mentioned above!
But: Is the battery more than 5-7 years it must be changed now! And that includes Your battery as well if You are reading this! Or You will be stranded at night at an unmanned gas station or similar!
Take My advice!
But: Is the battery more than 5-7 years it must be changed now! And that includes Your battery as well if You are reading this! Or You will be stranded at night at an unmanned gas station or similar!
Take My advice!
04-17-2018, 10:22 AM
#14
Burning Brakes
I followed Steve's advice here and added it to my 993 spec cheat sheet. I keep a printed copy in my toolbox and check the voltage yearly.
04-19-2018, 10:00 AM
#15
RL Community Team
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Yes, and I understand that the depth of the discharge profoundly impacts the cycle service life of a battery. For example, a battery that is only 20% discharged with each use cycle will have a service life north of 1000 discharge/recharge cycles where a battery that is routinely discharged to 50% or below its capacity will have a cycle service life of a few hundred discharge/recharge cycles. Interesting info picked up at Battery University Web SIte