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

21,475

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.
2,020

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

Porsche 928 Experts

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

Related Models For Sale

Used Porsche 911
147 Great Deals out of 4,929 listings starting at $10,850
Used Chevrolet Corvette
196 Great Deals out of 19,863 listings starting at $2,490
Used Porsche 924
12 listings
Used Ford Mustang
617 Great Deals out of 36,130 listings starting at $1,800
Used Mercedes-Benz SL-Class
62 Great Deals out of 2,987 listings starting at $4,500

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.