fuel injectors
suburbanjosh
02-19-2007, 11:55 AM
I have a 1988 4wd 1/2ton suburban with a 350 and tbi. Im just wondering how much fuel is supposed to be coming out of the jets when they are shooting out. Currently im geting a strong fuel smell and after changing the o-rings i no longer have a leak, but i still get a strong smell, while fixing the o-rings i noticed the jets look like they spit out a lot of fuel and wondered if that could be why i smell it so strong. Also wondering if to much fuel could cause something to leak.
2000CAYukon
02-19-2007, 08:29 PM
The ECM will increase fuel based on inputs from the MAP, 02 and TPS.
If the MAP is bad (will not hold a vacuum or returns wrong value), the ECM could send too much fuel. I also had an issue recently where the vacuum hose to the MAP would not hold a vacuum causing problems.
A bad O2 can cause the ECM to think the engine is running lean and give it more fuel.
If you have access to a scan tool, it would be a good idea to see what the MAP, O2 and TPS are doing.
//2000CAYukon
If the MAP is bad (will not hold a vacuum or returns wrong value), the ECM could send too much fuel. I also had an issue recently where the vacuum hose to the MAP would not hold a vacuum causing problems.
A bad O2 can cause the ECM to think the engine is running lean and give it more fuel.
If you have access to a scan tool, it would be a good idea to see what the MAP, O2 and TPS are doing.
//2000CAYukon
suburbanjosh
02-20-2007, 12:13 PM
is it possible to scan an 88
2000CAYukon
02-20-2007, 12:51 PM
is it possible to scan an 88
Yes. I use WinALDL (try a google search to learn more) on a laptop and a special cable (http://www.akmcables.com/ic.htm). WinALDL is limited but does give me the basics.
A scantool can do a lot more and can help determine why you are running rich.
//2000CAYukon
Yes. I use WinALDL (try a google search to learn more) on a laptop and a special cable (http://www.akmcables.com/ic.htm). WinALDL is limited but does give me the basics.
A scantool can do a lot more and can help determine why you are running rich.
//2000CAYukon
Willyswagn
02-20-2007, 10:07 PM
Keep us informed of the situation and solutions. I am having the same problem with an 89 burb.
I have a 1988 4wd 1/2ton suburban with a 350 and tbi. Im just wondering how much fuel is supposed to be coming out of the jets when they are shooting out. Currently im geting a strong fuel smell and after changing the o-rings i no longer have a leak, but i still get a strong smell, while fixing the o-rings i noticed the jets look like they spit out a lot of fuel and wondered if that could be why i smell it so strong. Also wondering if to much fuel could cause something to leak.
I have a 1988 4wd 1/2ton suburban with a 350 and tbi. Im just wondering how much fuel is supposed to be coming out of the jets when they are shooting out. Currently im geting a strong fuel smell and after changing the o-rings i no longer have a leak, but i still get a strong smell, while fixing the o-rings i noticed the jets look like they spit out a lot of fuel and wondered if that could be why i smell it so strong. Also wondering if to much fuel could cause something to leak.
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