i need help asap

edd112 · May 4, 2016

can someone please help me out?? ive been having a problem with my 2004 tahoe 5.3 flex fuel. first it started to rough idle and stall. now it doesnt even turn on. ive changed crank sensor, fuel pump and fuel filter and o2 sensor. its been through 3 mechanics and none were able to find the problem. the truck is all stock only upgrade was a bullet exhaust and led tail lights. its not fuel pump relay, ive tried a new one and still no start. the starter does work, the engine just wont start, it has proper fuel pressure and had spark plugs and wires changed. what could be wrong???????

cmc76 · May 5, 2016

going to need to read codes, if any.

clandr1 · May 5, 2016

Yep, please list any codes. Just shooting from the hip, it might be knock sensors. Could also be your intake gasket.

edd112 · May 5, 2016

clandr1 said:
Yep, please list any codes. Just shooting from the hip, it might be knock sensors. Could also be your intake gasket.

Have no access to a scanner . Bad knock sensors can cause no-start?

Rocket Man · May 5, 2016

An OBDII scanner can be had for less than $100 at your local auto parts store. It's a necessary tool for troubleshooting and will pay for itself very quickly.

clandr1 · May 5, 2016

edd112 said:
Have no access to a scanner . Bad knock sensors can cause no-start?

Do you have an AutoZone locally? They will pull codes for free.

Rocket Man · May 5, 2016

Well it won't start so that might be a problem even if he does have one since they require the vehicle! Unless towing is an option.

cmc76 · May 6, 2016

where are you from? there may be a local member who can help you out in the short term. otherwise, i think i got my scanner at harbor freight for like $75 on sale.

clandr1 · May 6, 2016

Red Rocket said:
Well it won't start so that might be a problem even if he does have one since they require the vehicle! Unless towing is an option.

Almost every auto insurance policy out there includes free towing up to a certain mileage limit per occurrence.

afpj · May 6, 2016

Is there actually a spark at the plug? Also check ground cables, especially one from engine block to firewall.

i need help asap

edd112

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