P0340 intermitent

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Joined
Jun 14, 2013
Threads
176
Messages
1,274
Location
Sandy Utah area
So I Bought my 97 (231k miles)about 4 months ago from a mudder and its been a bit problematic. When he sold it to me he was having trouble with a P0340 camshaft position sensor where the engine would stall, throw a code and occasionally idle rough. He put a new non-OEM dizzy on with a new CPS built in and it seemed to be working fine. It happened again after a few weeks of ownership and so i took it in for some coolant problems and the mechanic said the dizzy looked weird so he re-installed it and did the timing and it was working great for a while and now im stalling out again. Randomly the engine shuts off (no dash indication other than tach) and then if im going fast enough (freeway) it usually fires back up, mostly without a code. It seems to do it under load or WOT. at first I thought it was the fuel pump or fuel pump relay but It did it again last night and threw a code so I had it read this morning and got a P0340 CPS light again. The light was out on my commute this morning but it was idling poorly (250-300 rpm at times) and it cut out again on the freeway. Its getting more common and its a real problem for the times I want or need my wife to drive it.
Is there anything else that would though this code? I.e. since the engine stalls out and refires its not calibrated anymore or something? I was thinking about getting a new Fuel Pump relay just because of age and testing the Fuel pump via the manual but is there a chance its still the dizzy? or maybe something is shorting out my CPS? Any thoughts?
 
Did you guys resolve this issue, I am having the same code but not stalling and its running fine. 340 code comes on and off.
 
Did you guys resolve this issue, I am having the same code but not stalling and its running fine. 340 code comes on and off.

I took off the connector for the cps in the distributor, cleaned it up and put dielectric geese in there...Still idles rough but hasnt thrown a code or stalled for 40k miles
 
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PO put a new distributor in. The thing is it runs just fine. Most CSPS codes I read up on their rigs runs like crap or won't even stay running.
 
Bump....any news on resolving this?

I have the same problem. At highway speed, the tach goes crazy and the engine starts bucking. I normally pop it into Neutral then rev the engine and it recovers. Its also happens when driving through traffic with the A/C on and making a turn. Not cool when you are turning at a busy intersection and it stalls out with no power steering. Funny thing is it fires right back up when I restart. It seems to be much worse with the A/C on but its probably just the added engine load.
I did clean up the connector at the top of the distributor as mentioned above. No improvement. I also measured resistance per the FSM and was out of spec on the 2-4 measurement. I hesitate buying more parts yet after reading above.
 
Cracked distributor was letting moisture in and shorting. The distributor was not OE. Replaced with OE cap and its been smooth sailing ever since.
 
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