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93 Regina 940 B230F hesitation question - also hot no start fixed (RSR) 900

posted by  Schumi1 on  Sat Sep 8 09:23 CST 2012
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last visit: Thu Oct 16 09:52 CST 2014
[RELATED]

Hello all,

I have a simple yet strange question. The brick runs good but hesitation remains after many attempt to fix. Changing the whole fuel pump sending unit with pump stopped the hesitation for about 6 months but it is now slowly returning.
One new observation is - there seems to be less if none at all hesitation when the A/C is running. I assume the electric fan runs at all times when the A/C is on. Is there a connection between the hesitation and A/C - engine load ? I recently replaced the ECT sensor and no change.

Recently I had a crank, no start issue when the engine was warm/hot. This was solved by replacing the RSR (relay) with a new one. Curiously, I pulled the cover off the old RSR and there was nothing visibly wrong with it, no broken solder or wires, burn outs or corrosion. I guess they can just fail inside the coil where you can't see.

Any thoughts on the hesitation A/C thing would be appreciated.

Could the Air box temp thing cause hot air only coming in accross the ATS cause problems ?

Best,
Schumi1






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