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david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 1896
Experience:  owner/mechanic at 3D Automotive
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I have a 99 2500 suburban 454 vortec and I was going down

Customer Question

I have a 99 2500 suburban 454 vortec and I was going down the road to work and it just shut off like you turned the key off and wouldn't start back. I have replaced plugs plug wires coil distributor cap and rotor button ignition moduel cam sesor cranks sensor,still wont start but if you unplug to spark plug wires it will fire right up. any suggestions
JA: Is the car in "Park" or "Neutral?" Do you know if your car has a "wheel lock" feature?
Customer: park and yes I think I does
JA: Are you fixing your Suburban yourself? What have you tried so far?
Customer: yes and plugs , plug wires , distributor cap , rotor button, ignition module, cam sensor , crank sensor , fuel pump , fuel pressure regulator , and the coil
JA: Anything else you want the mechanic to know before I connect you?
Customer: no thank you
Submitted: 2 months ago.
Category: Chevy
Expert:  david craig replied 2 months ago.

Hi Im David. it starts if the spark plug wires are unplugged? i dont think so

Customer: replied 2 months ago.
you have to unplug 2 and leave 6 plugged up for it to start and I don't understand why cause when you plug them 2 back up it wont start
Customer: replied 2 months ago.
hello, did you get my last message
Expert:  david craig replied 2 months ago.

i got it

Expert:  david craig replied 2 months ago.

is it any 2 or a certain 2?

Customer: replied 2 months ago.
I only took off 2 and 4
Expert:  david craig replied 2 months ago.

try 2 different ones. this is interesting.

Customer: replied 2 months ago.
I though so to. would this happen if the timing chain jumped a tooth or 2
Customer: replied 2 months ago.
iv worked on cars for over 30 years and this has really stumped me
Expert:  david craig replied 2 months ago.

if the chain jumped a tooth, it would still start. if 2 then maybe, but a compression test would confirm that.

Customer: replied 2 months ago.
did compression test and I'm getting 130 to 145 on every cylinder
Expert:  david craig replied 2 months ago.

ok, well try 2 different plug wires. then i can get an idea of what might be going on.

Customer: replied 2 months ago.
I'm not in the garage now...scenario..if I change 1 and 3 and it starts what would be your plan of action
Expert:  david craig replied 2 months ago.

Ill need to did into my my manuals and programs and schematics.

Customer: replied 2 months ago.
can I get back in touch with you tomorrow when I get back in garage
Expert:  david craig replied 2 months ago.

absolutely. right here.

Customer: replied 2 months ago.
Is it another 5.00 dollars
Expert:  david craig replied 2 months ago.

nope.

Customer: replied 2 months ago.
thank you very much..have a great evening. if you think of anything different just shoot me a message
Expert:  david craig replied 2 months ago.

will do.

Expert:  david craig replied 2 months ago.

do you still need assistance?

Expert:  david craig replied 2 months ago.

please accept the answer and leave positive rating for me if you were satisfied with my assistance. thank you and have a great day

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