MAP turbo kit idle issue
So I recently installed a MAP v-band turbo kit with a Precision 5858 ball bearing turbo. I also installed a walbro 400lph fuel pump and ID1300cc injectors. Stock block and stock cams, currently running on 93. The car went to get tuned but my tuner had to leave me with a conservative map because of what seems to be a misfire. Under load, there is no evidence of it, it's only having trouble at idle. It idles steady and every few seconds, the rpms dip a bit and I hear a small "puff" from the the exhaust like it stutters. It does this at somewhat random intervals and I can't figure out the cause, no engine codes. I boost leak checked it and that's clear, as well as replaced the spark plugs. So at this point, I'm thinking it's fuel system related, either bad fuel pressure or a clogged injector. Any thoughts on this? Any other things that could be causing this? Is it actually a misfire? Maybe too much injector? So many questions, would appreciate any input.
|
What do the AFR's do when it does this?
|
Originally Posted by letsgetthisdone
(Post 11694859)
What do the AFR's do when it does this?
|
If I were you I wouldn't run it until you figure out what it is. I blew my engine because of an injector related problem that gave symptoms very similar to yours. Can you pull the injectors to see if theres any clogs? Also when you installed the pump did you use corrugated tubing?
|
Originally Posted by jakgal04
(Post 11694868)
If I were you I wouldn't run it until you figure out what it is. I blew my engine because of an injector related problem that gave symptoms very similar to yours. Can you pull the injectors to see if theres any clogs? Also when you installed the pump did you use corrugated tubing?
|
Its hard to test injectors without getting them flow tested, but do a quick visual check to make sure theres nothing in the fuel rail side of the injector, like gasket material or anything. Have you checked the spark plug gap and all that?
|
Originally Posted by Chokkan
(Post 11694861)
Afr is steady but will jump to around 15.5-16 when the suspected misfires happen
|
Originally Posted by jakgal04
(Post 11694879)
Its hard to test injectors without getting them flow tested, but do a quick visual check to make sure theres nothing in the fuel rail side of the injector, like gasket material or anything. Have you checked the spark plug gap and all that?
|
Originally Posted by letsgetthisdone
(Post 11694889)
Yeah, they jump lean because there is a misfire. Did you make sure there are no exhaust leaks upstream of the O2 sensor?
|
Sparkplug gap should be .020". But that will effect WOT way before it effects idle.
|
WOT runs sooth, but understandably, my tuner was concerned about pushing the car with it misfiring at idle. If it were to start running lean and misfire on the dyno, it could've caused some damage. So unfortunately I'm stuck with a light tune and not driving the car until I can diagnose and fix the issue.
|
I suspect your misfire is being caused my something like bad idle settings. An ignition system related misfire, or even fuel system would only become worse with load. If AFR's are normal at idle, I would look into what the MAF is doing (log MAF Hz, make sure its smooth, and not jumping around), and if could also be one of the idle settings.
Who is the tuner? His response to the issue makes me think you need to find a new tuner. |
Originally Posted by letsgetthisdone
(Post 11694938)
I suspect your misfire is being caused my something like bad idle settings. An ignition system related misfire, or even fuel system would only become worse with load. If AFR's are normal at idle, I would look into what the MAF is doing (log MAF Hz, make sure its smooth, and not jumping around), and if could also be one of the idle settings.
Who is the tuner? His response to the issue makes me think you need to find a new tuner. |
Did you do a rewire when you installed in the walbro 400?
|
Originally Posted by letsgetthisdone
(Post 11694957)
Did you do a rewire when you installed in the walbro 400?
|
All times are GMT -7. The time now is 02:29 PM. |
© 2024 MH Sub I, LLC dba Internet Brands