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I''ve got a problem with my 95 chevy 1500 2wd.

Sent to Chevy Experts January 12 2008 at 7:46 AM
   

I''ve got a problem with my 95 chevy 1500 2wd. It''s got a 5.7, and auto trans. It has a problem with backfiring under a load, from around 2-3000 RPM. The motor and trans are fairly new, I rebuilt the distributer when I put the motor in, haven''t done anything to the injecters.

 

Optional Information:
1995 Chevrolet 1500 2wd 350

Already Tried:
The problem just started, haven't tried anything yet. I don't want to start blindly replacing parts that I can't afford. Seems to improve a little with more gas in the tank, might be my imagination.

Customer (name blocked for privacy)
Time Left: 733055 days and 9 hours   Status:  Awaiting Customer Action   Value:  $15
Info Request
January 12 2008 at 10:01 AM (2 hours and 14 minutes and 36 seconds later)
         

Hi Studeguy, Supermechanic here. I just have a couple of questions about your truck.

Does it backfire through the intake or the exhaust?

Does the service engine light come on? If so, do you know the codes?

Do you know what the fuel pressure is?

Thanks.

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Super Mechanic -- Master technician -- 99% Positive Feedback on 1007 Chevy Accepts
29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Reply
January 12 2008 at 10:19 AM (18 minutes and 9 seconds later)
         
It's definitely backfiring through the intake. Tht service engine light has been coming on intermittently since before this problem started. The local parts store checked the code and said it indicated an oxygen sensor problem. I had replaced the oxygen sensor when I replaced the motor long before the light came on. I don't have any idea what the fuel pressure is. If it makes any difference, I've got a K&N filter setup instead of the stock airbox.(also installed when I changed the motor)
Customer (name blocked for privacy)
Answer
January 12 2008 at 10:53 AM (33 minutes and 20 seconds later)
         
ACCEPTEDCheck Mark

Hi 45, me again. It sounds like it may just be a bad ignition wire but we can't rule out fuel. If at all possible, check the fuel filter. I know how it is to check the pressure, (you need the adapters (not to mention a gauge). If the wires appear to be good, or not burned through by touching the exhaust manifold then it may be a good idea to just wet them and see if the problem gets noticeably worse.

Let's go for the easy stuff first, (although it can be more complicated) you don' t want to overlook anything. Let me know how it does. Thanx



REMEMBER, you don't have to ACCEPT until you are 100% satisfied with the answer. BUT, we don't get paid unless you hit the *ACCEPT* key.
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Super Mechanic -- Master technician -- 99% Positive Feedback on 1007 Chevy Accepts
29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Reply
January 12 2008 at 12:22 PM (1 hour and 29 minutes and 55 seconds later)
         
Supermechanic, I didn't find anything wrong with the ignition wires. I'm going to try a new fuel filter this afternoon. Do the think the injecters could be causing the problem?
Customer (name blocked for privacy)
Info Request
January 12 2008 at 1:13 PM (50 minutes and 34 seconds later)
         

When you take the fuel filter out you can see if it is clogged by blowing through it, (just tastes bad,,,lol)

Then you would want to know what the fuel pressure is.

Isn't that distributor that is run off the front of the crankshaft?

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Super Mechanic -- Master technician -- 99% Positive Feedback on 1007 Chevy Accepts
29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Reply
January 12 2008 at 3:27 PM (2 hours and 13 minutes and 47 seconds later)
         
Hi, This has the distributer at the back of the engine.(hard to get to) I think 95 is the last year they used the old style 350. I've got a filter, but won't be able to change it until tomorrow morning. I'll let you know then. Thanks!
Customer (name blocked for privacy)
Info Request
January 12 2008 at 3:56 PM (29 minutes and 36 seconds later)
         
Ok. You also may want to stop by an autozone store and have them see if there are any new codes in it. They do this at no charge. You may be getting an EST code or at least a lean running condition code, then we will know what direction to go in. thanx
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Super Mechanic -- Master technician -- 99% Positive Feedback on 1007 Chevy Accepts
29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Reply
January 13 2008 at 1:22 PM (21 hours and 25 minutes and 10 seconds later)
         
Hello again, I've changed the fuel filter. The old one was at least partially clogged. Blowing through the new one was a LOT easier than blowing through the old one. The scan at autozone indicated the oxygen sensor was making it run lean. The service engine light has been coming on for a couple months now, but it just started to run bad. Also, the problem seems to be worse when the tank is at 1/4 or below. I think I'm going to get the fuel pressure if I can. What is the pressure supposed to be at? Thanks, M.B.
Customer (name blocked for privacy)
Answer
January 13 2008 at 3:35 PM (2 hours and 13 minutes and 24 seconds later)
         
If I remember right it should be about 14psi. You might want to check with like, autozone they have that info,....just to be sure, thanks

REMEMBER, you don't have to ACCEPT until you are 100% satisfied with the answer. BUT, we don't get paid unless you hit the *ACCEPT* key.
You can also follow up after you ACCEPT, thanks
Picture
Super Mechanic -- Master technician -- 99% Positive Feedback on 1007 Chevy Accepts
29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
Reply
January 14 2008 at 8:00 AM (16 hours and 25 minutes and 12 seconds later)
         
Hi, I drove the truck yesterday until it was almost empty, and it seemed to run fine. I think the fuel filter was the problem, but I'm still going to get the fuel pressure checked. I've got to take a XXX XXXX XXXX trip pulling a trailer in a month or so, and I don't want any surprises. Thanks, XXXX X.
Customer (name blocked for privacy)
Info Request
January 14 2008 at 9:05 AM (1 hour and 5 minutes and 15 seconds later)
         
I hope that's all it was. Let me know if it's not. Thanks
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Super Mechanic -- Master technician -- 99% Positive Feedback on 1007 Chevy Accepts
29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering

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