The next LIVE chat with the SRT Engineers will be held Wednesday, August 5th
The session will run from from 6pm to 8pm EST as usual and will be held at Caliber Forums
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Follow the link in the first post of this thread - If you don't have a question you can always thank them for doing this or give your impression of your SRT8.
this was posted by mopars1
I own a 2005 SRT-4 and have only one issue that is not right that doesn't happen all the time. This condition seems to happen mostly on very hot or humid days, but not always. When the engine is started and driven for a short distance as a mile or less, the car will take off from a stop (normal throttle) and start to fall on its face. The more throttle is given the vac/boost gauge heads towards 0 (normal) but the engine gets no fuel and looses speed and then will start to buck and jerk violently. This will go on for a while and then it may come out of it on it's own or I can floorboard the go pedal and it takes off with all power restored. It may do this once or twice after the startup or it will do it several times. It can do it for quite a long time from several stops. It does not seem to make any difference if the engine is cold or hot. It seems like it is getting no fuel at all. It also can start idling rough and slow until the point of dying, but the check engine light has nerver illuminated. I have had it into the dealership, but naturally, it was not exhibiting the condition at that time and nothing was found. Now it is out of warranty. I worked as a tech for the dealership for 31 years, and it has me scratching my head. It seems like an oxygen sensor going nuts, but no fail codes set and I have no scan tool to hook up to it to watch while driving. Any ideas? Have you heard of this before? No tsb has been put out for this condition. I have owned the car since new. No add ons, all stock with the exception of an aftermarket air filter system. 22,000 miles and has done it since new.
i could not have typed it better myself cause i have the same issue. did this ever get answered??
this was posted by mopars1
I own a 2005 SRT-4 and have only one issue that is not right that doesn't happen all the time. This condition seems to happen mostly on very hot or humid days, but not always. When the engine is started and driven for a short distance as a mile or less, the car will take off from a stop (normal throttle) and start to fall on its face. The more throttle is given the vac/boost gauge heads towards 0 (normal) but the engine gets no fuel and looses speed and then will start to buck and jerk violently. This will go on for a while and then it may come out of it on it's own or I can floorboard the go pedal and it takes off with all power restored. It may do this once or twice after the startup or it will do it several times. It can do it for quite a long time from several stops. It does not seem to make any difference if the engine is cold or hot. It seems like it is getting no fuel at all. It also can start idling rough and slow until the point of dying, but the check engine light has nerver illuminated. I have had it into the dealership, but naturally, it was not exhibiting the condition at that time and nothing was found. Now it is out of warranty. I worked as a tech for the dealership for 31 years, and it has me scratching my head. It seems like an oxygen sensor going nuts, but no fail codes set and I have no scan tool to hook up to it to watch while driving. Any ideas? Have you heard of this before? No tsb has been put out for this condition. I have owned the car since new. No add ons, all stock with the exception of an aftermarket air filter system. 22,000 miles and has done it since new.
i could not have typed it better myself cause i have the same issue. did this ever get answered??
[SIZE=2][SIZE=2]Check the wires going to the throttle position sensor. If they are zip-tied tight to the chassis, they may not have enough slack as the engine rolls under acceleration. Over time the wires will deteriorate as they are stretched and the throttle position signal becomes inconsistent. When this happens the ECU cannot rationalize engine RPM increase as the actual throttle opens when it cannot see the throttle opening (bad throttle signal). The usual compaint is a "stumble" when switching gears or taking off from a light, anytime there is significant engine rock under load.
To check the wires, unplug the wiring connector to the TPS (white, three pin connector) and bend the harness, you may find a section of the harness that bends very easily as the copper is broken or very thin at this point. To fix the issue, cut the wires 1/2" to either side of the break and solder in 2" of new wire. Be careful not to confuse the wires (Ground, 5 volt reference, and sensor signal) when soldering in the extension wires.
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I have contacted the SRT Engineers for you and they should be answering shortly. Thanks for your participation in the session!
Nadeem
Quote: Originally Posted by SRTengineers
[SIZE=2][SIZE=2]Check the wires going to the throttle position sensor. If they are zip-tied tight to the chassis, they may not have enough slack as the engine rolls under acceleration. Over time the wires will deteriorate as they are stretched and the throttle position signal becomes inconsistent. When this happens the ECU cannot rationalize engine RPM increase as the actual throttle opens when it cannot see the throttle opening (bad throttle signal). The usual compaint is a "stumble" when switching gears or taking off from a light, anytime there is significant engine rock under load.
To check the wires, unplug the wiring connector to the TPS (white, three pin connector) and bend the harness, you may find a section of the harness that bends very easily as the copper is broken or very thin at this point. To fix the issue, cut the wires 1/2" to either side of the break and solder in 2" of new wire. Be careful not to confuse the wires (Ground, 5 volt reference, and sensor signal) when soldering in the extension wires.
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**SRT Chat Session - Aug 5th
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