Brian Mitchell

Can you be more specific regarding what you mean by "Ht leads not resistively supressed type, A bad lead?" I don't quite follow.

For ignition the engine has a 009 distributor, Bosch wires, Bosch blue coil, NGK BR7ES plugs. I have shielding (grounded) around the trigger wire that goes from the RPM converter to the ECU. And I have all ground wires terminating on a dedicated grounding bus bar. The RPM converter gets it's signal from the (-) coil. And that wire has the appropriate resistor installed. In an effort to isolate things from potential electrical noise I've gone so far as to pull the ECU and rpm converter out of the car and powered it using a separate battery. I set up the ECU and RPM converter on a table and extended the wiring harness to the engine. Then I ran the engine on it's own battery with the alternator disconnected. So, ECU and engine had their own separate battery power, and no alternator putting power into the system. And even after isolating the ECU from the car, and running the car only on battery power I still get the problem. I also hooked up a vacuum/boost gauge and noticed that the engine stumbles when the manifold pressure begins to transtion from vacuum to boost. Its at those moments when the engine bogs down, stumbles, and belches blue smoke.

Another thing I found odd in Diagnostic mode was the MAP readings; they don't seem realistic. It shows the intake pulled 101kPa on an engine run that didn't exceed 3000rpm. I can't imagine I was getting anywhere near 101kPa. And btw is it possible to reset the Diagnostic readings on the fly? I keep having to shut the engine off to get Diagnostic to start new readings. There is the 'UPDATE' button, but it doesn't reset anything.

I tried adjusting the 'trim pot'. If I'm reading the markings correctly it's infinitely adjustable resistance between "1" to "3". I found it set in what seemed to be the max low postion, at "1". I moved it to various positions but didn't seem to make any difference. I couldn't hear any difference in the engine running. And it didn't do anything to help the MAX RPM in Diagnostic mode. And it didn't change the rpm reading in Runtime mode. One thing I noticed was the MAX RPM in Diagnostic mode was almost perfectly 2x the tachometer in the dash.

I'll give that a try.

Trigger comes from an "RPM Converter"...a little black box with a "Link Engine Management" decal on it. And the RPM converter gets a signal from the (-)terminal on the coil.

To clarify the issue...I want to know why Runtime Displays indicate actual engine RPMs, but the Diagnostic shows erroneous information. According to the manual it indicates a 'trigger glitch'. Wouldn't an actual trigger glitch effect Runtime Display reading also? And how do I go about fixing it?

I have the 'FuelLink' fuel only ECU on my 1967 VW Bug w/ T3 turbo. It was set up and tuned by a well regarded engine builder. But, I'm experiencing some problems and he is 3,000 miles away. The engine seems to have two problems. First it seems to misfire, stumble, bog down, around 4000 to 4500 RPM at wide open throttle...it belches blue smoke when doing this. Second, it seems to be running crazy rich. The spark plugs are fouled, exhaust smells like raw gas. When hooked up to the PCLink I click "Diagnostics" under Runtime Displays and get a MAX RPM reading which is unrealistically high; sometimes into the 10K range. The MAX RPM consistantly reads ~2500 to ~3500 over actual engine RPMs. I refered to the manual which indicates this is a classic indication of a "Trigger Glitch". However, the other Runtime Displays display the RPMs accurately. For example, in Digital, Gauges, Plotting the RPMs read accurately. And by accurate I mean those displays indicate the RPMs are the same as the VDO tacho in my dash. Why would it read RPMs correctly in the various Runtime Displays but "Diagnostics" indicate a trigger glitch?

This is from my Link "Fuel Only ECU". What type of terminals are used in this connector? I want to alter the harness and want to use the correct terminal. I need the specific, correct name for crimp-on terminal. Thanks in advance.