97 flashing CEL & Running Rough
April 9th, 2009, 2:08 PM
#41
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No I don't think you need to recheck gap, you can check the plugs for fouling but with the new cap and rotor, injector cleaner any fouling will soon be history unless you are getting a great deal of oil past the rings.
You can probably back off on the injector cleaner to about a bottle every 10th fill up or about 5k miles. If you can try filling up with Chevron fuel as it already has the additives.
I've been doing the the additive in my 07 Tahoe at about every 7-10k miles
not because I have an issue but more of a long term non scientific study to see if down the road it will really make a difference when I get to 100k miles.
I have been using the top tier fuels (Cheveron / Tetco and Shell) since I bought her, I previously used Exxon (not top tier) in my 97 Tahoe.
You can probably back off on the injector cleaner to about a bottle every 10th fill up or about 5k miles. If you can try filling up with Chevron fuel as it already has the additives.
I've been doing the the additive in my 07 Tahoe at about every 7-10k miles
not because I have an issue but more of a long term non scientific study to see if down the road it will really make a difference when I get to 100k miles.
I have been using the top tier fuels (Cheveron / Tetco and Shell) since I bought her, I previously used Exxon (not top tier) in my 97 Tahoe.
April 9th, 2009, 3:48 PM
#42
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Doing better than me with top tier gas as I buy whatever I'm closest too! Didn't get the truck new, so figure that the previous owner probably did the same thing. Wonder if the additives that you can buy that are connected to the pumps are any good? Probably would be better off spending my money on proven technology, but man do they make it convenient.
Thanks again for your help. Installing dual flowmasters this week, so can't wait to hear her rumble!
Thanks again for your help. Installing dual flowmasters this week, so can't wait to hear her rumble!
June 21st, 2009, 4:20 PM
#44
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continued..
I used all AC/Delco parts, if I recall the gaskets came as a kit, also replace the pressure regulator while you have everything off, the regulator looks like it should have something connected to it but it does not..
Note the paper towel in the TBI, that was for when I was removing the intake to prevent anything from falling thru to the intake
protect the cylinder intakes after removing the intake cover, I was under a tree (lol shade tree) and didn't want leaves or twigs falling on the windshield and sloping right off into the intakes.
DON"T for get to removed the paper towels before installing the cover back on. I did use paper towels with the reasoning that if they did go it they would cause the least amount of damage and would probably burn and pass thru the system if it did happen, a shop rag would not.
I used all AC/Delco parts, if I recall the gaskets came as a kit, also replace the pressure regulator while you have everything off, the regulator looks like it should have something connected to it but it does not..
Note the paper towel in the TBI, that was for when I was removing the intake to prevent anything from falling thru to the intake
protect the cylinder intakes after removing the intake cover, I was under a tree (lol shade tree) and didn't want leaves or twigs falling on the windshield and sloping right off into the intakes.
DON"T for get to removed the paper towels before installing the cover back on. I did use paper towels with the reasoning that if they did go it they would cause the least amount of damage and would probably burn and pass thru the system if it did happen, a shop rag would not.
Can you tell me how you removed each injector from the spider assembly? Do they just pull out?
June 21st, 2009, 4:36 PM
#45
Administrator
Honestly I don't recall exactly how they came out but they were not hard, I can look thru my manual and verify the removal process but here is a pic of them after I removed them...
https://chevroletforum.com/forum/alb...4&pictureid=19
https://chevroletforum.com/forum/alb...4&pictureid=19
Last edited by in2pro; June 21st, 2009 at 4:37 PM. Reason: corrected picture link url
June 21st, 2009, 5:44 PM
#46
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In2pro,
Thanks for the response. I am out in the 150 degree garage right now trying to remove them. I am not replacing them just yet. Money is REAL tight and I am just doing some troubleshooting right now. Basically, I am consistently getting a P0304 #4 misfire. I have tried everything else. What I tried to do was remove just the tubing and the poppet from the base of the injector for #2 and #4 and swapped them there and at the intake. I did this to see if the issue switched to a #2 misfire. Then I would know that it was the poppet itself. No luck. It stayed on # 4. Now, I want to remove the injector itself and swap #2 and #4 at the spider assembly. Of course the poppets will be put in the corresponing hole on the intake side. Then, if the issue changes to a #2 misfire, then I know it is the injector for sure. It runs fine, but my inspection is out at the end of next month and it won't pass with an SES light.
It seems that you have to insert some type of pin on the connector side to make them unsnap. Does that sound familiar?
Thanks for the response. I am out in the 150 degree garage right now trying to remove them. I am not replacing them just yet. Money is REAL tight and I am just doing some troubleshooting right now. Basically, I am consistently getting a P0304 #4 misfire. I have tried everything else. What I tried to do was remove just the tubing and the poppet from the base of the injector for #2 and #4 and swapped them there and at the intake. I did this to see if the issue switched to a #2 misfire. Then I would know that it was the poppet itself. No luck. It stayed on # 4. Now, I want to remove the injector itself and swap #2 and #4 at the spider assembly. Of course the poppets will be put in the corresponing hole on the intake side. Then, if the issue changes to a #2 misfire, then I know it is the injector for sure. It runs fine, but my inspection is out at the end of next month and it won't pass with an SES light.
It seems that you have to insert some type of pin on the connector side to make them unsnap. Does that sound familiar?
June 21st, 2009, 5:55 PM
#47
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In2pro,
I just got them out. Will let you know if this troubleshooting technique works. I know you are not suppose to only replace one, but if the error moves to #2, then I have no choice but to only do that one that is bad. Thanks for the help.
I just got them out. Will let you know if this troubleshooting technique works. I know you are not suppose to only replace one, but if the error moves to #2, then I have no choice but to only do that one that is bad. Thanks for the help.
June 21st, 2009, 8:49 PM
#48
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In2pro, I was right. I switched the #4 and # 2 injector at the spider assembly and the poppets at the intake side and the error is now a P0302 #2 misfire. So I am positive just that one injector is bad. Thanks for your help.