03 s10 fuel pump or injectors


Asked by Mar 16, 2016 at 07:17 PM about the 2003 Chevrolet S-10 3 Dr LS ZR2 4WD Extended Cab SB

Question type: Maintenance & Repair

I am having problems with my truck. It died on me
and I checked the codes, it said maf and random
misfire, I had recently replaced the cap and rotor
and the plugs, so I replaced the conto module and
the maf. Started and ran for a few days, same thing
this time it came up with catalyst sys below
threshold bank 1 so I replaced the o2 sensor, ran
for a couple days. Did it again this time I replaced
the cap since it is notorious and again ran about a
week, shut off again so I called someone for
advice and checked the converter to see if it was
clogged and it was so I straight piped it for the
time being. Wasnt running when parked checked
the fuel pressure and it was fine got and ohm
reading on the cam sensor ignition coil and
injectors through that big connector, all good
checked the fuel pressure again good, started up
drove around the building and changed the fuel
filter and it hasn't given any problems as of yet but
I am concerned it will do this again and getting to
50 mph and higher is a challenge, how can you tell
if it's the pump or the injectors?

7 Answers


What size is the engine?


I need to know the size of the engine.


Need to do a fuel leak down test.


4.3l spider injection. Leak down test? How do you perform that?

1 out of 1 people think this is helpful.

Good morning. You will need a fuel pressure gauge that hooks up the the Schrader Valve on the intake manifold. You cycle the key on, off until fuel pressure builds up. It should be 56 to 63 lbs. Once the pressure is built up turn the key to the off position. Watch the fuel pressure gauge, it should not drop off more than 5 lbs. in 3 minutes. If it does, there are either leaky fuel injectors, spider lines, or regulator. It is recommended to replace all as a unit.

Best Answer

This ended up being the pigtail on the ignition coil was bad everything else was good.


Glad you found the problem.

Your Answer

Add photo

Related Questions


Looking for a Used S-10 in your area?

CarGurus has 1,813 nationwide S-10 listings starting at $1,749.


Search Chevrolet S-10 Questions

Chevrolet S-10 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,970
#2 John Saffrahn
John Saffrahn
Reputation 890
#3 Trebor66
Reputation 840
View All

Related Models For Sale

Used Ford Ranger"
255 Great Deals out of 7,800 listings starting at $988
Used Chevrolet Silverado 1500"
2,429 Great Deals out of 144,008 listings starting at $1,995
Used Chevrolet Colorado"
317 Great Deals out of 17,586 listings starting at $2,495
Used GMC Sonoma"
9 Great Deals out of 582 listings starting at $1,799
Used Toyota Tacoma"
645 Great Deals out of 30,295 listings starting at $2,850
Used Ford F-150"
3,161 Great Deals out of 216,444 listings starting at $1,000
Used Dodge Dakota"
157 Great Deals out of 4,804 listings starting at $900
Used Chevrolet Blazer"
1,629 listings starting at $1,999
Used Nissan Frontier"
432 Great Deals out of 20,684 listings starting at $2,500
Used GMC Sierra 1500"
1,024 Great Deals out of 56,366 listings starting at $2,400
Used Dodge Ram 1500"
513 Great Deals out of 13,857 listings starting at $995
Used GMC Canyon"
117 Great Deals out of 8,517 listings starting at $1,500
Used Chevrolet Camaro"
796 Great Deals out of 38,874 listings starting at $2,650
Used Ford Mustang"
720 Great Deals out of 41,405 listings starting at $900

Used Cars For Sale