Grandprix 2003 code P1811 long shifting or hesitating when accelerating

Based on the symptoms you have described, it sounds like there may be an issue with the transmission in your Mazda 3. The loud clicking sound when shifting into reverse could be a sign of worn or damaged gears, while the hesitation and lurching in first gear could be due to a slipping or malfunctioning clutch.
It's also possible that there could be an issue with the transmission fluid, such as low or dirty fluid, which can cause shifting problems and other issues. I would recommend having a qualified mechanic inspect your vehicle to diagnose the exact cause of the problem and recommend the appropriate repairs.

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

Peoples Transmission

Only feels vibration when braking and there is no fault in the engine, the problem is in the brake rotors , Feels vibration in the steering wheel, when applying the brake ?

Check for Codes & look at all data
Have the spark plugs been changed every 3 years
since the truck was new
Have all the ignition coils failed or been replaced since
2003.
And on & on
Can't be all that hard to get figured out

Have the transmission control module tested.

Sounds like a malfunctioning egr system. Too much egr gasses at once will lean out the air fuel mixture and cause hesitation in an engine. Just my 2 cents.

What is hesitating - the engine or the transmission?

When starting the car and putting it in gear, if the transmission shifts immediately into first gear and then shifts smoothly from first to second gear, I doubt its a transmission problem. However, if that isn't the case, you will probably need a new or rebuilt transmission ($1500+).

Engine hesitation can be due to a lot of things related to the fuel system that won't necessarily show up on a code reader - for example, dirty throttle body, fouled IAC (idle air control) motor, fouled EGR valve, etc.

Have your checked your trans fluid?

There are diagnostic tools that could help detect what your problem is. The Snap-On Modis, or preferably a "Tech-2" GM scanner. Any reputable transmission shop, or GM dealer should have at least one of the two. It sounds to me like it could be the transmissions "EPC" (Electronic Pressure Control solenoid) The EPC controls main line pressure, in an effort to keep shift firmness, and shift duration at one specific level. This is to compinsate for the natural wear a transmission encounters, and to keep emissions as low as possable, by keeping shift duration low. When the EPC malfunctions (and thats somthing that they like to do in the 4t65E), it typically starts to shift harder than normal. They typically throw a P1811 code. (P1811 is a "max adapt-long shift" code) And the malfunction can be intermittent. Hope this helps, and good luck.
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