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david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 1221
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: 12 days ago.
Category: Chevy
Expert:  david craig replied 12 days ago.

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

Customer: replied 12 days 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 12 days ago.
hello, did you get my last message
Expert:  david craig replied 12 days ago.

i got it

Expert:  david craig replied 12 days ago.

is it any 2 or a certain 2?

Customer: replied 12 days ago.
I only took off 2 and 4
Expert:  david craig replied 12 days ago.

try 2 different ones. this is interesting.

Customer: replied 12 days ago.
I though so to. would this happen if the timing chain jumped a tooth or 2
Customer: replied 12 days ago.
iv worked on cars for over 30 years and this has really stumped me
Expert:  david craig replied 12 days ago.

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

Customer: replied 12 days ago.
did compression test and I'm getting 130 to 145 on every cylinder
Expert:  david craig replied 12 days ago.

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

Customer: replied 12 days 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 12 days ago.

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

Customer: replied 12 days ago.
can I get back in touch with you tomorrow when I get back in garage
Expert:  david craig replied 12 days ago.

absolutely. right here.

Customer: replied 12 days ago.
Is it another 5.00 dollars
Expert:  david craig replied 12 days ago.

nope.

Customer: replied 12 days ago.
thank you very much..have a great evening. if you think of anything different just shoot me a message
Expert:  david craig replied 12 days ago.

will do.

Expert:  david craig replied 9 days ago.

do you still need assistance?

Expert:  david craig replied 5 days 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