1979 porsche 928, cis fuel system which means there is fuel all the to the injectors . so if i have a good spark and fuel why dont car stay running. porsche 928.

10

Asked by Jul 24, 2013 at 10:03 AM about the 1979 Porsche 928

Question type: Maintenance & Repair

79 Porsche 928 have cis fuel system..(constant fuel to injectors). if I have spark, fuel and
compression car shot start? well it does as long as I keep giving it starting fluid. pulled a few injectors they are wet, which makes me think they are firing. don't fully understand what causes car not to stay running if all three major components are present.  could not enough pressure from the fuel pump cause this problem?  just bought a new pump.it wasn't a bosch.

2 Answers

20,815

fuel pressure should be measured at fuel rail, fuel filter can clog if old, and bad fuel will throw you a curve

2 of 2 people found this helpful.
1,770

Are you getting a pulse at the injector(s)? If not, you can have a bad crank sensor or even a bad ECU. Check for pulse with a test light to one of the injector wires or using a long probe to listen for an electronic "click". No noise or no flashing probe light, then that"s your problem. Also check your fuel, it should always be fresh. Plugs will ignite starting fuel but sometimes won't work on old gas, so check your plugs also. Good luck

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

Search Porsche 928 Questions

Porsche 928 Experts

#1 Tom Demyan
Tom Demyan
Reputation 130
#2 MTA1968
MTA1968
Reputation 120
#3 Michael Griffin
Michael Griffin
Reputation 100
View All

Related Models For Sale

Used Porsche 911
97 Great Deals out of 4,464 listings starting at $12,500
Used Chevrolet Corvette
219 Great Deals out of 22,127 listings starting at $3,850
Used Porsche 924
11 listings
Used Ford Mustang
735 Great Deals out of 44,990 listings starting at $1,500
Used BMW 3 Series
1,037 Great Deals out of 31,547 listings starting at $975

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.