no spark

[onestar]

i recently got a 1978 928 and i know the fuel pumps are bad but when me and my dad poored some gas into the engine just to see if it would start the engine cranked but it wasnt getting spark we are trying to check all the wires but we dont know what the resistance should be at or if its something simple we just missed if anyone has any ideas what the problem is please help

[MPDano]

Check and clean all ground and 14 pin. Replace Green Wire if condition looks bad. My write up on the green wire.

Porsche 928 Forums dot com - View topic - Pics of my First 928 and Current Project

14 Pin DIY here. Also other possible tips.

**MOST Common 928 Issues AND Fixes**

[stepson]

Yep, probably the infamous green wire. At least that's where I'd start.

[onestar]

thx all ill check it out later right after i look for some new fuel pumps im going to try to use just one pump that has the power of both to save some money i think it should work

[stepson]

Onestar,
Where are you located? Someone close may be able to help you.

[lfausty]

is 78 a euro or usa ? cis fuel system? 5sp auto? * post pic,please, of your pcar. **might want to add info in profile

[MPDano]

Originally Posted by lfausty

is 78 a euro or usa ? cis fuel system? 5sp auto? * post pic,please, of your pcar. **might want to add info in profile

A 78 US or Euro will pretty much be a CIS car. The Green wire would be in all years up to at least the 83 (my S). Not real sure of how far up the years the green wire was still there.

Good call on putting the Model year in your Signature!

[DPW928]

In addition to checking the previously mentioned items, you need to check the following.

1. Grounds, especially where the body connects to the engine.
2. Ohm test the coil.
3. Check the voltage at the coil during cranking. It should be at least 6 volts. If less than 6 volts, check the resistors.
4. Check positive battery cable where it connects to the starter.
5. Check the electrical connections at the back of the ignition switch.

[stepson]

Originally Posted by MPDano

A 78 US or Euro will pretty much be a CIS car. The Green wire would be in all years up to at least the 83 (my S). Not real sure of how far up the years the green wire was still there.

Good call on putting the Model year in your Signature!

+1 on the MY. The green wire was used up through model year 1984 in the US version of the cars(L-jet). The Euro (ROW) versions in 1984 and above were LH controlled injected engines and the green wire was supplanted by the CPS (a whole nuther set of issues)

[onestar]

ok its a 78 i think US 5 spd manual

[onestar]

i just put some pics up in my profile not the best looking 928 but its my first car and im happy

[MPDano]

Great pics. Where are the spark plug wires?

[onestar]

Originally Posted by MPDano

Great pics. Where are the spark plug wires?

i just took them off so i could check the green wire im
going to put the distributer cap back on once i check it

[onestar]

i cant find the 14 pin connector ive looked at the pics but i cant tell where its at from those

[MPDano]

Originally Posted by onestar

i cant find the 14 pin connector ive looked at the pics but i cant tell where its at from those

You can't miss it. It's right next to your Front Hot Post.

[stepson]

Nice picture!!

[onestar]

thx guys i found it cleaned everything up spayed some starting fluid and it started right up now i gotta order some fuel pumps and it should finally be good to drive thx again for the help

[MPDano]

Originally Posted by onestar

thx guys i found it cleaned everything up spayed some starting fluid and it started right up now i gotta order some fuel pumps and it should finally be good to drive thx again for the help

Don't get too happy just yet. Spark is just the beginning. You see a lot of 928's that run with pouring gas or hitting it with some starting fluid.

Replace the pump and report back. I sure hope this is just the problem.

[onestar]

now you have me scared of whats to come

[MPDano]

Originally Posted by onestar

now you have me scared of whats to come

Nothing to be scared about. It's just a fact that most of us went through already. We'll sort you through it.

Also, how long has your 928 sat? If more than a year or two, you need to drop the tank and flush it. Old gas is like molasses, it will plug your new pump and filter if your lucky. If it makes it's way towards your fuel injection too, it will plug it up there too.