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what would cause the engine to sure while accelerating up a hill between 2000-2500rpms yet not anytime else?

Robert Wolfe
135

Asked by Robert Oct 18, 2012 at 04:59 PM about the 2002 Pontiac Grand Prix GT Coupe

Question type: Maintenance & Repair

what would cause the engine to sure while accelerating up a hill between 2000-2500rpms yet not anytime else?  i've been told its my egr valve, catalytic converter from one mechanic, another mechanic told me to just put duct tape over the rpm gauge so you don't watch it, another told me it might be my ignition module.  the car has a 3.8L with 225000mi on it.  i don't really want to have to buy another car & have full coverage insurance & a car payment.  would rather just fix the problem.

3 Answers

Robert Wolfe
135

I'm looking into the EGR Valve/Catalytic Converter or Ignition Module, duct tape doesn't fix everything. It only fixes what you don't want to fix.

Jason Zane
2,905

surge? up a hill, it tends to down shift the X-mission for climbing..... shake? a bad ignition module will shake on idle and run rough with power loss(miss) at 45 mph.

John Saffrahn
12,835

Check the motor mounts. The extra stress from the vehicle going uphill may be causing the slightly bad motor mount to act worse. Have someone watch the engine while the car is shifted from drive to reverse. Very little movement is allowed, with the double wishbone motor mounts in this the engine should hardly move. Like jason said any of those three would be present all the time not just uphill. A catalytic converter wouldn't just show up only uphill. EGR would trip a code and so would an ICM. If its not the mounts I would lean towards a trans issue. Its the added stress causing the problem so its something that doesn't do well with stress.

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