supercharged xj troubleshooting
After i installed the supercharger and an AEM Fi/c i started to have the following problem! When i drive for about 10 miles the jeep starts acting like the following video!
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supercharged xj troubleshooting
Search for members here named Cobramarty and boostwerks, they're the SC guys to help you out.
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Originally Posted by Outlaw Star
(Post 3128100)
Search for members here named Cobramarty and boostwerks, they're the SC guys to help you out.
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It could be SC compressor surge.
Do you have a SC bypass valve in place? |
Originally Posted by CobraMarty
(Post 3128485)
It could be SC compressor surge.
Do you have a SC bypass valve in place? Only map and the sensor on the intake manifold left to change! |
I doubt that any sensor or map changing will make a difference.
Check for any vacuum leaks. My kits all have a SC bypass valve to prevent compressor surge. During idle and high vacuum, the valve is open and air after the TB bypasses the SC and goes directly into the intake manifold. This keeps the SC cooler and because it is not compressing air, it free spins and uses minimal power like 3-5hp and hence doesn't cost any mpg while cruising out of boost. With low vacuum, the valve closes and all air goes thru the SC. Still check for vacuum leaks. |
Typically this type of behavior is related the idle air control valve.
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Do you have resistors installed for the injectors?
Wideband gauge? I'd check the short and long term fuel trims as well. It is more than likely bouncing around trying to hone in on 14.7 but if the fuel corrections are to large it will fluctuate rich to lean causing the RPM's to fluctuate as well. I'd honestly recommend taking it to a local tuner if possible |
Originally Posted by Boostwerks.com
(Post 3129151)
Do you have resistors installed for the injectors?
Wideband gauge? I'd check the short and long term fuel trims as well. It is more than likely bouncing around trying to hone in on 14.7 but if the fuel corrections are to large it will fluctuate rich to lean causing the RPM's to fluctuate as well. I'd honestly recommend taking it to a local tuner if possible |
Originally Posted by 9krpmrx8
(Post 3129138)
Typically this type of behavior is related the idle air control valve.
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Originally Posted by CobraMarty
(Post 3129129)
I doubt that any sensor or map changing will make a difference.
Check for any vacuum leaks. My kits all have a SC bypass valve to prevent compressor surge. During idle and high vacuum, the valve is open and air after the TB bypasses the SC and goes directly into the intake manifold. This keeps the SC cooler and because it is not compressing air, it free spins and uses minimal power like 3-5hp and hence doesn't cost any mpg while cruising out of boost. With low vacuum, the valve closes and all air goes thru the SC. Still check for vacuum leaks. |
If your doing this yourself, you will need a wide band gauge. It is more than likely a fueling issue.
Have you watched the maps under real time while it does this? You'll want to know exactly what cells it is bouncing around in. If there is a large difference between those cells, it can cause this issue. It's essentially bouncing between target values |
Originally Posted by gsamakovlis
(Post 3129205)
I have changed that too. No difference!
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Originally Posted by Boostwerks.com
(Post 3129238)
If your doing this yourself, you will need a wide band gauge. It is more than likely a fueling issue.
Have you watched the maps under real time while it does this? You'll want to know exactly what cells it is bouncing around in. If there is a large difference between those cells, it can cause this issue. It's essentially bouncing between target values |
Which model AEM? 1910 or 1913(chrysler specific)
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