fuel injector problems?

kdog05 · 2009-11-03T19:50:00+00:00

About a month ago while driving on the freeway the engine light came on, and engine started to act funny. If i tried to give it gas to quickly it wouldn't respond, but if i did it slowly ti did ok. Eventually after about two days of driving it carefully the engine started to run better, and the engine light went off. Since then i have had the engine light come on several times and get progressivly worse, and have noticed it that the light tends to come on if i hot rod it a little, then same thing happens a couple days later of taking it easy the light goes off. I did have a chip on it and thought that was causing it so i unhooked it, and about three days later i was driving normall and the light came on then the truck had no throttle response and sounds like its knocking realy hard it only idles and if you give it gas it has no response. I got a tester and it came up with three codes: 1: Fuel pump relay circuit malfunction injectors 2,3,5,8. 2: Fuel rail pressure range/perfromance 3: fuel injector 2 control circuit malfunction I replaced the fuel pump relay under the hood fuse block and the engine still runs poorly. while the motor is running and i pull off the electrical connector on cylinders 2, 3, 5, and 8 one at a time nothing happens if i pull off cylinder 1, 4, 6, or 7 one at a time the motor dies the second i pull it off. (not sure what this meens but tried it anyways). I don't think it's the injectors and the rely is fine any suggestions would be appreciated

2005 CHEVROLET SILVERADO

65,000 MILES • V8 • 4WD • AUTOMATIC

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.

ASEMASTER6371

CAR REPAIR CONTRIBUTOR
52,796 POSTS

no, no re set. they are fired on start up by the signal sent to the computer from the distributor pick up. it looks at the first 200 rpm to get the truck running. check it for 800-1500 ohms and on cranking should produce an ac voltage.

it was a common failure.

Roy

Aug 21, 2020 at 9:41 AM (Merged)

HMAC300

CAR REPAIR CONTRIBUTOR
48,601 POSTS

no you just need to take the top off but that still may not cure it it should be professionally scanned so they can see if all your sensors are working correctly and have the correct voltage. that spider thing is about $500

Aug 21, 2020 at 9:41 AM (Merged)

JOE1953

MEMBER
776 POSTS

i had the computer scan the only code show is po305 and that code is cylinder number 5 misfire detected, the sparkplugs and sparkplug wires are good and the compression on number 5 cylinder is 195 psi.

Aug 21, 2020 at 9:41 AM (Merged)

HMAC300

CAR REPAIR CONTRIBUTOR
48,601 POSTS

do what you want like I said a pro should check this because there are certain other sensor or low fuel pressure that can cause this along with outher things. I have no further suggestions

Aug 21, 2020 at 9:41 AM (Merged)