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Installed new injectors, still didn't fix it?

Tiny
JOEGETRIGHT
  • MEMBER
  • 1997 CHEVROLET CHEYENNE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 147,256 MILES
I recently replace my SCPI injectors to MFI, because 1 of my injectors wasnt working. My truck ran fine for a day, and its SPUTTERING as if it wants to shut of during Idle and while its Running.

Prior to this problem my truck was running on 5 cylinders. Thats the reason I changed the injectors and I was told that its a common problem with the original injectors. Mides well replace them all. Right.
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Friday, August 27th, 2010 AT 11:42 AM

25 Replies

Tiny
TOMASLV
  • MEMBER
  • 2 POSTS
  • CHEVROLET CHEYENNE
I own a 98 Chevy Cheyenne 1500 305 5.0 truck. It has approx. 130, 00 miles. I need to replace my injectors for the second time in 2 1/2 years. Is there reason why these injectors can be causing such a problem in a short amount of time? Can you also explain to me if possible how to replace them. Being that I am a full time college student I don't have the money for expensive shop labor fees. I also had them cleaned as well as my fuel pump and fuel filter replaced twice. Any type of info or help would be greatly appreciated, thank you.
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Monday, June 1st, 2020 AT 1:42 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Whats going wrong with them, are they shorting out or are they plugging up.

To remove just take off the air intake manifold and the fuel injectors should pull out of the rail with a firm pull.
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Monday, June 1st, 2020 AT 1:42 PM (Merged)
Tiny
TOMASLV
  • MEMBER
  • 2 POSTS
My engine idles hard and misses when accelerating. I thought cleaning them would solve the problem, but that was just a temporary fix. I actually had the injectors replaced a year and a half ago. I was mistaken when I said it was 2 1/2 yrs. When adding the cost of parts and labor for reparing twice, I can buy a new engine. It's been very frustrating.
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Monday, June 1st, 2020 AT 1:42 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Change the fuel filter and drain and scrub your fuel tank, may be full of bad gas causing the injectors to plug up and stop working.
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Monday, June 1st, 2020 AT 1:42 PM (Merged)
Tiny
INDYUKE
  • MECHANIC
  • 416 POSTS
Also fuel with a high ethanol content is known to plug fuel injectors at a furious rate. It leaves a lot of deposits which harden after turning off your engine and plug up the fuel injectors and coat a lot of stuff.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
CHEYENNE
  • MEMBER
  • 2 POSTS
  • 1994 CHEVROLET CHEYENNE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
History of injector problems?
One cylinder is half dead. Pro told me it might be blown out with a long highway drive on premium gas.
I haven't done that.
In the meantime, it idles rough and I'm certain I'm not getting the mileage I could.
Anybody have to replace injectors?
Anybody get results without such drastic measures?
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check that cylinder's sparkplug, compression and injector-
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
CHEYENNE
  • MEMBER
  • 2 POSTS
Will do (when there's light again), and post back Fri

Thanx for checking in.
Paul
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
ALLABOUTCHEVY
  • MEMBER
  • 5 POSTS
  • 1988 CHEVROLET CHEYENNE
  • V8
  • 2WD
  • AUTOMATIC
I have a 1988 Chevy c1500. Fuel injectors aren't letting fuel into the throttle. The fuel pump comes on and im getting fuel pressure. I just changed the computer but nothing changed. Is there any other sensors that control the injectors. Its a 5.7 tbi.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It sounds like you have a shorted fuel injector which is common. Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
ALLABOUTCHEVY
  • MEMBER
  • 5 POSTS
Im getting spark on all plugs. Im not getting pulse though. Im getting power to one side of the injectors. I noticed when I ground out the other side the injector stays on.

Thanks
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Yes, that's how an injector works. The computer pulses the ground. Is you're check engine light coming on for bulb check when the key is turned on?
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
ALLABOUTCHEVY
  • MEMBER
  • 5 POSTS
Yes the check engine light comes on but I don, t get any codes but 12 meaning no problems detected.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Things are starting to look like the injector is shorted which will stop the drivers from working.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
VILLAFUERTEJOSEPH85
  • MEMBER
  • 3 POSTS
  • 1988 CHEVROLET CHEYENNE
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
Injectors won't fire there is fuel to the injector I know because when I use a tester light to check if injectors have power right and left lead wires show power but when I test the left wire on either injector it will fire what little gas it has in there.I left my phone recording they don't shoot while cranking at all. Appreciate the help thank you for your time
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
ALLABOUTCHEVY
  • MEMBER
  • 5 POSTS
That's what I thought, I changed injector for a new one and the truck started thank you so much for your help.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Are you missing anything else? With the engine cranking, do you have spark at the plugs? Your computer controls the fuel injectors on the ground side, engine cranking. The engine has to be cranking to check ground pulse for fuel injector. If the computer doesn't see rpm signal, no injector pulse. The rpm signal comes from distributor. I haven't looked at your wiring, yet.

I'd also want to check fuel pressure. Check for applicable trouble codes, see if anything shows up. Your obd1, you should be able to check codes, yourself. You use a jumper wire between the A & B terminals at datalink connector, turn key just till the dash lites come on, no further. The mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
VILLAFUERTEJOSEPH85
  • MEMBER
  • 3 POSTS
Last time I checked the spark coming from the wires next to the engin block I did just did the fuel pump did the distributor set up about 3 years back its was pretty corroded in there I have another computers from you pull it it still didn't shoot the injectors or it shoots when it wants cuz before it was shooting on the left side but the right side would not fire and would be flooded on top got different injectors from you pull it they both work but now won't fire while cranking again again thanks for the help
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Monday, June 1st, 2020 AT 1:43 PM (Merged)
Tiny
ALLABOUTCHEVY
  • MEMBER
  • 5 POSTS
I found another problem that I fixed at the same time. It was a bad wire coming from the ignition module. Thanks for your help.
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Monday, June 1st, 2020 AT 1:43 PM (Merged)

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