Chevrolet

Ask a Chevy Question, Get an Answer ASAP!

Have your own Chevy question?

9 Chevy Mechanics are Online Now

characters left:

Not a Chevy Question?

Question

''98 2500 silverado 4wd 350 vortech. I lost spark. Tested dist., crank sensor, replaced coil and ign. mod. Truck quit while plowing snow. Have 50 psi fuel pres.Fuses are good. Trans was replaced prior to my purchase. Is there a sensor in trans that would cut spark, or has the ecm failed? No obdII codes come up.(screen blank,cc flashes).

Submitted: 630 days and 20 hours ago.

Category: Chevy

Value: $15

Status: AWAITING EXPERT REPLY

Optional Information:
1998 Chevrolet CHEVY 350VTECH

Already Tried:
CHECKED DIST,CRANK SENS, REPLACED COIL, IGN MOD. 50PSI FUEL.NO SPARK

Posted by Carhelp4u 630 days and 16 hours ago.

Info Request

How did you verify the no spark situation? I am also interested in how you tested the fuel pressure? Was the pressure tested by turning the key from off to on?

629 days and 22 hours ago.

Reply

I used a digital volt meter on power and ground leads to verify voltage pulse. Fuel pressure was measured with key on for several seconds after pump shut off. This truck ran worse in wet weather and would stall after hitting water. Would start right back up though. The cap, rotor, plugs and wires have all been replaced prior to this event. I have a clip-on spark tester, and used different plug wires as well as the coil wire.

Answer

Well I am concerned with the fuel pressure first. Your fuel system needs to produce 60-66 psi of fuel to operate the poppet style injectors. I am wondering also if you have examined the distributor cap for any moisture since all of this has occured. Gm actually had a info bulletin regarding problems somewhat like wht you are having. The bulletin was in reference to a clogged screen in the bottom of the distributor. This screens purpose is to allow for the distributor to vent.

Accepts:
Expert:	Carhelp4u
Pos. Feedback:	99.8 %
Answered:	3/3/2008

ASE CERTIFIED TECH

ASE CERTIFICATION

626 days and 14 hours ago.

Reply

The cap, rotor, plugs, and wires were just replaced about 150 miles prior to this event. NO SPARK now. Truck stalled while plowing snow. I checked cap for moisture, none. Truck has been in heated garage for 3 weeks now, still no spark. Dist drive gear is good ,truck is in time. Seems to be no slack in chain.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Chevrolet

Have your own Chevy question?

Question

Optional Information

Optional Information: 1998 Chevrolet CHEVY 350VTECHAlready Tried: CHECKED DIST,CRANK SENS, REPLACED COIL, IGN MOD. 50PSI FUEL.NO SPARK

Info Request

How did you verify the no spark situation? I am also interested in how you tested the fuel pressure? Was the pressure tested by turning the key from off to on?

Reply

Answer

Reply

Related Chevy Questions

Optional Information:
1998 Chevrolet CHEVY 350VTECH

Already Tried:
CHECKED DIST,CRANK SENS, REPLACED COIL, IGN MOD. 50PSI FUEL.NO SPARK