aftermaket distributer for 96 up 4.3???

[nomaboy]

anybody know if you can get one that will utilize the stock wiring and sensors???
thanks

[droopy89]

Accel
http://www.jegs.com/webapp/wcs/stores/servlet/CategoryDisplay?storeId=10001&catalogId=10002&catalogIdentifier=Jegs_Direct&categoryId=14075&parentCategoryId=10679

MSD
http://www.jegs.com/webapp/wcs/stores/servlet/CategoryDisplay?storeId=10001&catalogId=10002&catalogIdentifier=Jegs_Direct&categoryId=14551&parentCategoryId=10679

scroll down a little ways on both of em

[Maximus]

I recommend the MSD.I have had bad luck with several Accel products.I have personally tested their wires and have seen in some instances that they had more resistance than old factory wires I had just removed.And have seen their coil fail with very few miles on them.Never messed with their distributors so I can say but I never recommend their other products that I have personally used.MSD,Mallory,and Crane I have had good luck with all their products especially MSD.That's my input for what it's worth.

[extreme gmc]

would replacing ones distributor give you any more power or anything like that?
Charlie

[Sparky2263]

would replacing ones distributor give you any more power or anything like that?
Charlie

Nope. Only needed if you are exceeding the stock distributors capabilities. Which you aren't.

[nomaboy]

yea i know it won't give me any more power but i am now to the point of replacing everything i can think of to get rid of my missfire. eventually i will get it. i am thinking maybe a cam sensor or distributer problem

[Sparky2263]

Didn't know you were trying to get rid of a misfire. What code(s) are you setting and what conditions does it misfire? Also, what has been done in the attempt to fix the misfire?

[nomaboy]

have had it for a year. replaced plugs, wires, coil (multiple times) cap and rotor, ign. box, tps sensor, computer, fuel injector assembly and pressure regulator. have re-lashed valves.
no codes are setting. it is intermittant. when it misses it starts at about 5000rpm and the tach jumps back and forth from 5k to 6k if you let off the gas it will shift and then it pulls good until it hits 5 k again. somtimes it does not miss at all, somtimes it does not miss as bad.
there is absolutly no lack in power under 5k.
thanks for the feedback

[Sparky2263]

Let's review;

The ignition system consists of the following components and wiring circuits:



The Ignition Control (IC) module
The ignition coil
The Powertrain Control Module (PCM)
The Crankshaft Position (CKP) Sensor
The Camshaft Position (CMP) Sensor
The distributor (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/58948514), the distributor cap (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/34872099), and the rotor
The EI wiring circuits between the CKP and PCM use the following service common names:



The Crankshaft Position (CKP) Sensor (1) signal
Low reference
12-volt reference
The EI wiring circuits between the CMP and PCM use the following service common names:



CMP sensor signal
Low reference
12-volt reference
The Electronic Ignition (EI) wiring circuits between the PCM, IC module, and coil use the following service common names:



IC timing control
IC output signal
The IC module and the ignition coil both receive fused power on the ignition 1 voltage circuit. The IC module is also supplied an independent ground connection.

The EI system is responsible for producing and controlling a high energy secondary spark. This spark is used to ignite the compressed air/fuel mixture at precisely the correct time to provide optimal performance, fuel economy, and control of exhaust emissions.






This electronic ignition system is known as a High Voltage Switch (HVS) distributor (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/58948514) ignition system. Trigger information is supplied only by the CKP sensor. The CMP (HVS) is located inside the distributor, and is used for fuel injector sequencing and misfire diagnosis. There is no back-up or by-pass system used, so the engine will not run without a valid CKP input. The PCM signals the coil to fire through the IC module. The resulting secondary energy is distributed to the spark plugs (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/58828691) by a conventional distributor cap (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/34872099) and rotor assembly.
The CKP sensor (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/56514317) is located in the engine front cover perpendicular to a reluctor ring mounted on the crankshaft nose. The reluctor ring has 3 or 4 slots depending on whether the engine has 6 or 8 cylinders. As the reluctor rotates past the sensor tip, the slots change the sensor magnetic field to produce a voltage ON-OFF signal. Based on these signals, the PCM is able to determine crankshaft speed and position.






The CMP sensor is located in the distributor (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/58948514) base. The distributor is driven by the camshaft and distributes the secondary voltage to the spark plugs (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/58828691) through the distributor rotor, cap, and wires. The CMP sensor produces a signal once every revolution of the camshaft. The CMP signal identifies the position of the # 1 cylinder relative to the crankshaft.


The ignition coil provides the necessary secondary energy to produce a strong enough spark at the plugs. The coil is triggered by the IC module which in turn is commanded by the PCM (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34857030/101367125). There is no back-up or by-pass function in the IC module.


The PCM (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34857030/101367125) is responsible for maintaining proper spark and fuel injection timing for all driving conditions. Ignition Control (IC) spark timing is the method the PCM uses to control spark advance and ignition dwell. To provide optimum driveability and emissions, the PCM monitors input signals from the following components in calculating IC spark timing:



The CKP sensor
The CMP sensor
Engine load
Engine speed
Atmospheric or barometric pressure
Coolant temperature
There is one circuit between the PCM (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34857030/101367125) and the IC module. This circuit is called the ignition timing signal and is by the PCM to command the IC module to trigger the coil.

There is only one mode of operation in this ignition system. The PCM sends timing signals to the IC module. The IC module will then amplify and send a signal to the ignition coil which will produce high voltage secondary energy. This high tension voltage will then be distributed through the coil high tension wire, distributor rotor, cap, and plug wires. Since the distributor (http://motoralldata.com/alldata/MOTOR~V40880583~C35621~R0~OD~N/0/80851247/83214995/83215052/83215054/34853741/34857029/34859584/58948514) has no influence on the base timing, adjusting the distributor will not change the base timing. However, the distributor on V8 applications can be adjusted to eliminate the chance of crossfire at the distributor wire terminals. Distributor terminal crossfire may cause poor performance. The V6 engine applications do not use an adjustable distributor.

(Courtesy Alldata)

In other words, the distributor, other than identifying Cyl #1 and spinning the rotor, has nothing to do with ignition. That's the crank sensors' job. The description you are giving of your miss leads me to thinking you have a weak valve spring. If you can get hold of a scanner that has the misfire monitor you'll be able to pinpoint which cylinder is missing. I seriously doubt it's an ignition miss.

[nomaboy]

i a while ago i was thinking valve spring but i reconsidered because it is intermittant. but if thats what your thinking then it makes me feel better about it and i will get different springs. i got the springs that the crane recomended crane PN 99848 with that cam crane PN 99848 . but it calls for 1.5 rockers and i got 1.6. could that weaken them? what should i look for in a spring to replace these with. i know you don't want to get a too stiff spring. and what kind of scanner. is their a scanner on the market in the handheld size or just the big professional ones?
thanks for the help

[nomaboy]

http://www.cranecams.com/?show=browseParts&lvl=3&prt=122&action=partSpec&partNumber=99845-16
do you think these springs would work better for me??

http://www.cranecams.com/?show=browseParts&lvl=3&prt=122&action=partSpec&partNumber=99848-16
these are the ones i have now.

http://www.cranecams.com/?show=browseParts&lvl=2&prt=5&Vehicle_Type=Auto&Cylinders=6&Engine_Make=CHEVROLET&Year=2001&Engine_Size=4.3%20L&partNumber=1439811&partType=camshaft
this is the cam i have only i used 1.6 rockers instead of 1.5

[Sparky2263]

I would say the spring you have is good. Marginal, but good. The other spring, at your installed height, will probably be too stiff for a stock valve.

Any decent diagnostic scanner will have the misfire monitor. I use the Snap-On Graphing "Red Brick" scanner and it has it. The reason for this would be purely diagnostic. If it was random cylinders misfiring, that would eliminate valve springs. They ain't all getting weak at the same rate, ya' know? ;)

Hopefully it's a single cyl so you can hone in on it. Find somebody with the required scanner and find the problem.

[nomaboy]

ok thanks a lot. i'll see if i can find a scanner.

http://store.summitracing.com/partdetail.asp?autofilter=1&part=AXY%2D4000&N=700+115&autoview=sku

http://store.summitracing.com/egnsearch.asp?N=700+115+310819&D=310819

would either of these do that?

if not i could take it to a shop but i would like to have the capability of doing this myself again in the future. knowing this truck i probably will have to.

[Sparky2263]

Even better.....

http://cgi.ebay.com/ebaymotors/Snap-On-Scanner-MT2500-Super-Deluxe-Domestic-and-Asian_W0QQitemZ260024953508QQihZ016QQcategoryZ4398 9QQrdZ1QQcmdZViewItem

[nomaboy]

thats a little more than i have right now