Maybe i'm on drugs but this is weird

[90Q45blue]

Ok guys, I don't know if i'm on crack or what but there's this problem with my Q that no one else notices when riding but me.

:So I'm driving along and everything is going fine. Loving my car and all that gushy stuff when it 'lurches'. By lurches I mean it seems to lunge forward for a split-second but then it's fine. No one riding notices it but I the driver do.

Has anyone heard of this problem or have any remedies?

Nick

P.S. will be posting list of problems i want to tackle over the summer shortly

[PalmerWMD]

Please give us more details like it says here:

http://www.nissaninfiniticlub....=6869

Fred..

[90Q45blue]

Sorry Fred,

1990 Q45, 247,703 on the odometer. Original engine. Rebuilt transmission at 238,000 w/ transmission cooler. I've recently replaced 2 injectors, MAF connector, P/S pump, shocks and thermal temp sensor on engine. All parts are OEM. I also replaced spark plugs about a year ago (ngk). Location is Kansas so really weird weather all the time.

If you need any other information just let know. Thanks in advance for your help.

Nick

[PalmerWMD]

At what speeds and which throttle position and which transmission selector postion does this tend to occur?

Fred..

[90Q45blue]

Usually takes place in the 25-40mph range. transmission is on drive. I don't have a JWT TCU so it still starts in second gear. I'm not flooring it or anything so I'd say about mid-throttle.

Nick

[Q45tech]

Might check for a worn spot [momentary drop out in resistance] of TPS voltage. The ecu only checks TPS for function at start up, if voltage is close to right then drops for a split second might cause something like you describe........hard to track down even to test for this........get a junk yard replacement and swap..............things with 250k can develop weird symptoms.

Could also be the lockup TC clutch in transmission.

[Q451990]

A problem with knock sensors will cause hesitation in this range, that may feel like a surge or slight jerk.. have you checked ECU codes lately?

Heath

[90Q45blue]

Thanks for the help guys. I will be checking both the TPS voltage and the ECU codes this weekend. I'll let you know what I find out.

Nick