Hello All,
I’ve owned a beautiful Maserati 3200GT Manual for over 20 years now with only 40,000klm on the clock. I have finally been confronted with the dreaded Throttle Body problem.
My car was recently suffering with intermittent throttle hesitancy and a jerky driving response.
I removed the air intake pipes to observe the reaction of the TB butterfly and confirmed that it was intermittent and unstable during the slow depression of the accelerator pedal.
I also had a CEL indicator on the dash for the last 6 months.
I did not have the equipment to analyse the CEL yet, but nevertheless decided to upgrade the TB to use the contactless Sacer parts. This was successfully done by me, following all instructions, and by my local soldering expert.
Upon re-installing the upgraded TB, I was devastated to find no improvement! In fact, the TB butterfly now shows almost no movement at all with the depression of the accelerator with ignition on. The only movement occurs when turning the ignition to the On(MAR)position, and is identical to that shown in the video from Davy83 in #103 of this thread……ie a tiny cycle of only a few millimeters. With ignition off, the butterfly moves freely, so I think the motor and magnet are OK.
I have already done the TB reset and pedal calibration procedure as per the manual, a few times….. but with no improvement.
I doubt if the problem is the pedal pot., as the pre-modified TB butterfly did move all the way open on slow depressing of the accelerator pedal (albeit with sticking and jerky movements).
Also, I have now successfully analysed the fault codes using the UniDiag KWP 2000 software, and cleared the codes. The codes haven’t come back……yet(?).
The diagnosis had the following results:
P0110 (Intake Air Temperature Circuit Malfunction),
P0220 (Throttle/Pedal Position Sensor/Switch B Circuit Malfunction),
P0121 (Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem),
P0500 (Vehicle Speed Sensor Malfunction),
0x1172 (item not found on list).
The car starts easily and drives OK for speeds up to 30kph. Any quick depression of the accelerator pedal causes immediate ‘choking’ and spluttering and loss of power.
Does any forum member have any suggestions to help fix the TB problem?
By the way, I have not yet re-potted (with neutral-cure silicone) the soldered contacts in the upgraded TB. So, I could test the contacts with a multimeter, if I knew the values.
Thank you in advance…