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1997 chevy silverado,misfire on cylinders 4,6,3,5...Replaced

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plugs,wires,cap,rotor,updated injector housing,and also removed...
1997 chevy silverado,misfire on cylinders 4,6,3,5...Replaced plugs,wires,cap,rotor,updated injector housing,and also removed distributor to check gear. I have full fuel pressure. I also have to press the gas pedal a bit to get it to start up. It will idle but barely.
Submitted: 1 year ago.Category: Chevy
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7/8/2016
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago
Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 7,702
Experience: ASE Certified Master Technician
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So basically the cylinders in the middle are all misfiring. Is this the 5.7 and is it a throttle body fuel injection? If so, have you looked to see if both fuel injectors are working?

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

This is a SFI, isn't it?

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Customer reply replied 1 year ago
5.7 liter.csfi i believe,i just installed the updated spider injector unit.
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

Did you have these misfires before that?

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

Have you checked for spark on those cylinders that misfire?

Will it run better for a few seconds with a few shots of starting fluid into the throttle body?

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Customer reply replied 1 year ago
All misfires were present before doing anything to the vehicle,nothing has changed. I did check for spark on those cylinders with spark tester and they all seemed good. I have not tried spraying anything into the throttle body yet. I have a new fule filter on the way,and once i get that installed i can try that.
Customer reply replied 1 year ago
The customer has stated that he was just driving normally and was accelerating up a hill and once at the top of hill it started misfiring like crazy and running rough.
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

Yeah, if dirt has somehow made it past the fuel filter, which I don't know how it could, I suppose the poppets I believe they are called may be clogged. I assume they can be cleaned but personally, I have never done so.

If after the fuel filter and it runs better for a few seconds on the starting fluid, I would see about cleaning them poppets.

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Customer reply replied 1 year ago
I just replaced that whole injector unit,it is the upgraded unit with the actual injectors.
Customer reply replied 1 year ago
I just replaced the whole injector unit with the updated one, It was around 300 bucks. it hasnt been in there an hour yet.
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

Ok, what abo a compression test to rule out a blown head gasket on each bank?

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Customer reply replied 1 year ago
Havent performed a compression test yet. The fuel filter just arrived so i will install that and see what happens.
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

ok

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Customer reply replied 1 year ago
I previously did a compression test which i failed to mention. My fault. They were all between 175-190 on the gauge. At this moment i have already tried everything you mentioned before you even suggested it,so with that being said i am not satisfied with results thus far and do not believe i should get charged for this!
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

You are not getting charged, you only made a deposit. You only get charged if you give me a good rating otherwise you can ask for your deposit back. Is that what you want to do? If so, you have to contact customer service. If you would rather continue, have you suspected a vacuum leak and checked for one, like a huge one?

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