I need scan tool for 496 HO
 

I broke a valve spring while docking the boat at idle, I replaced all valve springs and added a pair of lightning headers while I was at it, but now I get two beeps while at idle. Now the question , did the valve spring trigger the alarm or it possible that the headers are causing some kind of water
tempeture or presure problem.
The port side risers run @20/35 degrees hoter .
I need to buy a scan tool I'm trying to make Havasu this weekend.

just ordered scan tool ($$$$$) I hope to get it tomorrow. I almost think it's my IAC because when I rev up slighthly I get a faint drop in rpm then it picks up. It problably has nothing to do with valve breaking or new headers.

Do your headers have a temp sensor? if you disconnected the original manifold temp sensors and did not reconnect to anything, that would cause an alarm. I guess Im'm a little late, but I just listed a DDT type scan tool on ebay.

Dave

Im thinking manifold temp & waterflow (balancing) issues thru the new headers... This has happened a lot latley on the 496's... :) Jamie / Lakeside


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I suspect it could be a water balancing flow problem as well, if you take laser temp reader and aim it at each riser the front port side is @40 degrees hoter than the rear starboard riser,however, the difference at each temp sensor is only @ 10 degrees not enough to trigger an alarm.
I also believe it could be my water hose presure. Ihave a well with a pump presure fluctuation of 40 to 20 lbs. So it may be that at its lowest it triggers low water preasure (if it is equipped with) sensor.

got the scanner and the only code that it had was ECT temp hi. It turrned out to be that a pin on the coolant temp sesor had been pushed out during the install and thus causing alarm to sound off.