Car still won't start! |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Car still won't start! |
silverteener |
Apr 24 2010, 04:45 PM
Post
#1
|
Member Group: Members Posts: 214 Joined: 9-August 05 From: East Moline, IL Member No.: 4,566 |
OK,
I've been helping a fellow member that bought a 73 1.7 w/ original fuel injection and we cannot get it to run. The former owner said it had a fuel issue and parked it for 2 years. so far we've replaced all the fuel lines, had the tank dipped and sealed and replaced the sock, put in a new fuel pump, and put on a new fuel filter. We have fuel at the injectors, they do spray and the fuel pressure is 28. There is no spark coming from the spark plugs. we pulled a plug and turned the engine over and it didn't spark. We should see spark here right?? so we moved up to the coil. We have 12v at the black wire and we put on a new condensor. I also just checked the points and they do spark when I open them. I did this by pulling all the wires off the coil and I hooked a wire from the negative side of the coil to the condensor wire and another wire from the positive side to the battery. I also checked the gap on the points and it is ok. It also has a new rotor and cap. We also put my coil on and tried it and still no spark. it doesn't even hint at turning over. There is something weird about this car and it was like that before but the negative for the battery is mounted to where the coil mounts. and there is another ground from the case up to the coil. The bolt is broken on the body where the negative side of the battery should connect so they mounted it on the coil instead. Any suggestions on what to do next. I'm running out of ideas! thanks Scott |
ericread |
Apr 24 2010, 05:21 PM
Post
#2
|
The Viper Blue 914 Group: Members Posts: 2,177 Joined: 7-December 07 From: Irvine, CA (The OC) Member No.: 8,432 Region Association: Southern California |
Since you mentioned "spark" and "grounding" issues, to what did you ground the spark plug when you got no spark? I am assuming the engine case? You might want to try another ground for the spark plug test. I only say that to possibly rule out the entire spark energizing system. At this rate your have un-tested dist cap, rotor and spark plug wires.
What is the manufacturer and model of your dist cap and rotor? I have been told that there are a few manufacturers that make what appear to be 914 caps and rotors, but do not work well with our cars. I look forward to more information. Eric Read |
silverteener |
Apr 24 2010, 05:58 PM
Post
#3
|
Member Group: Members Posts: 214 Joined: 9-August 05 From: East Moline, IL Member No.: 4,566 |
truthfully we just took the spark plug out and turned over the motor to see if it would spark. I didn't know I would need to put it close to metal. I can try that. I'm not sure of the mfg. I know the cap is orange and I have 2 rotors we used, one was grey and one is orange.
|
silverteener |
Apr 25 2010, 04:48 PM
Post
#4
|
Member Group: Members Posts: 214 Joined: 9-August 05 From: East Moline, IL Member No.: 4,566 |
Well I just had my dad come over and we confirmed there is no spark at the spark plugs (IMG:style_emoticons/default/confused24.gif)
|
Jeffs9146 |
Apr 25 2010, 05:49 PM
Post
#5
|
Ski Bum Group: Members Posts: 4,062 Joined: 10-January 03 From: Discovery Bay, Ca Member No.: 128 |
Spark Plug wires!!??
Bad ground?? |
Tom |
Apr 25 2010, 06:20 PM
Post
#6
|
Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
Try this, Pull the coil high voltage wire from the dizzy and place it near a ground source, ( some metal piece that is grounded). Then remove the negative wire from the coil ( should go to the dizzy inside), now with 12 volts to the positive side side of the coil, use a short piece of wire to short the negative side of the coil to ground for a very short time. Like you are replicating the points, alternating a short and then opening. This should give you a spark from the high voltage coil wire to ground. If not, then the coil is defective. If there is a spark, then put the high voltage wire back to the dizzy and short negative side of the coil to ground again ( ensure that the rotor is in contact with one of the cap's plug wires). If you have spark now from the plugs to ground, you know the coil, rotor, and dizzy cap are good.
In the interest of safety, make sure you don't have any gas leaks in the engine bay or the sparks could cause a fire! Tom |
silverteener |
Apr 26 2010, 01:22 PM
Post
#7
|
Member Group: Members Posts: 214 Joined: 9-August 05 From: East Moline, IL Member No.: 4,566 |
I will try that tonight. I put my coil on his car before and it still wouldn't start. I think tonight I'm going to try putting my cap and spark plug wires on his car and see if it works. I know the condensor is good and the points do have spark. just can figure out why there no is spark at the plugs? thanks for the tip!
|
silverteener |
Apr 26 2010, 08:50 PM
Post
#8
|
Member Group: Members Posts: 214 Joined: 9-August 05 From: East Moline, IL Member No.: 4,566 |
I put my cap and plug wires on and no change. that is about as far as I got tonight. I took note of the wires on the coil. on the + side we have a purple/black wire and red/green wire. on the - side we have a red/black wire and the green wire going to the condensor. does this sound right?
|
Lennies914 |
Apr 26 2010, 09:14 PM
Post
#9
|
Slacker Group: Members Posts: 828 Joined: 9-January 10 From: NorCal Member No.: 11,216 Region Association: Northern California |
Black/red (larger wire) goes on +
Black/purple & green condensor wire goes on - |
underthetire |
Apr 26 2010, 09:16 PM
Post
#10
|
914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
No it does not sound right. My 73 had only 1 wire on the + (+12v) side, and 2 on the negative, condenser and tach signal.
I don't think mine had a red green, but I can't go look right now. |
silver74insocal |
Apr 26 2010, 10:08 PM
Post
#11
|
Senior Member Group: Members Posts: 736 Joined: 26-November 09 From: rancho cucamonga Member No.: 11,073 Region Association: Southern California |
have you metered the tranny ground strap? if its bad, you have an open circuit. grounding to the engine wont work because of the rubber mounts. Dave
|
silverteener |
Apr 27 2010, 07:10 AM
Post
#12
|
Member Group: Members Posts: 214 Joined: 9-August 05 From: East Moline, IL Member No.: 4,566 |
I will double check the trans ground strap tonight. I never tested it. It also sounds like we have the wires mixed up on the coil too!
|
SLITS |
Apr 27 2010, 07:19 AM
Post
#13
|
"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
Green w/ Red is the oil idiot light sender lead. Not to be connected to the coil.
|
Lo-Fi Version | Time is now: 31st October 2024 - 05:40 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |