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Old 09-30-2007, 12:30 AM   #1
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i replaced the belt, replaced sc seal ad made sure no leaks, added a 180* stat,new upper radiator hose, replaced tensioner pulley with a 3.5". replaced all vacuum lines. new pcv valve.

i drove it today with ect temp at 181*, iat at 72*, i saw 1kr @4600-4900 and when cae shufted at 5200 it jumped to 4 kr.

is there something i am missing that will cause kr. what fuel trim should i watch. LT or ST. what range should i be at. tell me what to do and i will do it,
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Old 09-30-2007, 12:40 AM   #2
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Is your fuel pressure up to par? I suggest you get a GOOD fuel pressure gauge with a longer hose, and drive around with the gauge, and see what the pressure is doing.

How about your exhaust manifolds? Have you pulled them off and thoroughly inspected them for cracks? Some are so small, a magnifying glass is needed to see them. Remember, these cracks expand as the manifolds warm up.
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Old 09-30-2007, 12:47 AM   #3
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yes. manifolds have been removed and welded all cracks. fuel pressure is 38 @ idle and 46 when driving and boost at 7psi. wot
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Old 09-30-2007, 01:26 AM   #4
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A KR spike is not out of the normal during a shift, I've heard. As long as it goes away quickly.
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Old 09-30-2007, 11:20 AM   #5
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That'* a sign the fueling doesn't recover for the next gear in time.

You need a wideband O2/rpm log/scan done to find out what needs to be corrected.
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Old 09-30-2007, 11:24 AM   #6
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how much does that cost
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Old 09-30-2007, 11:29 AM   #7
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I have no idea. The easiest way is to go on a dyno with wideband O2, and log the whole band. Not a single gear pull. You need to show all shifts.

The other way is to buy a wideband O2 sensor and software ($300+), but that won't give you RPM data. Add a Gtech to the list, and if you're really creative, you can overlay the incompatible data from both units on each other for evaluation.
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Old 09-30-2007, 07:33 PM   #8
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do u use the wideband o2 along with the narrowband o2. or do u remove the narrow and replace with the wide band. what newer cars can i get a wideband off of so i dont have to buy a brand new one.
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Old 09-30-2007, 08:28 PM   #9
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Your PCM won't know what to do with wideband data.

You run a second sensor.
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Old 09-30-2007, 10:13 PM   #10
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