Becks Bear
Active Member
- Posts
- 258
- Location
- Northern Ireland
After a full upgrade and service on my V8 3.9EFI electrical system which was completed yesterday I took it for a test drive, everything was working fine except when I press the accelerator hard the engine lets say at about 50mph it appears to be running on 7 cylinders, no mis fire just loss of power/shudders until I back off on the throttle.
If I press the accelerator slowly, I can get to above 70mph no problems.
The engine was running ok before I upgraded the system, had a valley gasket leak, yes running rich, yes sometimes hard to start cranking over a long time, so hence the upgrades and service, but once started ran like a dream.
Engine oil and filters changed every 3000miles
New valley gasket (Just for info)
New steering pump (as I had the front stripped)
New fuel pressure unit and all set to the correct PSI
New in tank fuel pump, all new filters on the fuel system
New distributor, complete with new cap and rotor from RPI
New spark plugs NGK BPR6ES
New RPI amp, plus Bosch coil
New temp coolant sensor
New magncour leads
Timing set at 6degrees BTDC, and set up with a timing light, with vacuum hose disconnected in fact set up several times as I wasn’t happy with the first set up.
Base idle set with vacuum hoses blocked, 570rpm on the Rovergauge on the laptop, when vacuum hoses connected RPM is then sitting at 770rpm which sounds nice
No fault codes on the Rovergauge software when driving.
MAF out put voltages are ok as per diagnostic info found on this web site, and set at 1.5v due to the Adams ECU remapped.
TPS output voltage was high so I set the voltage as per the instructions, THIS was done last month before I changed all the parts. I plan to test voltage and adjust tomorrow but not sure if this is the fault?
After reading the long story above can anyone shed some light on my next course of action?
many many thanks in advance Ives
If I press the accelerator slowly, I can get to above 70mph no problems.
The engine was running ok before I upgraded the system, had a valley gasket leak, yes running rich, yes sometimes hard to start cranking over a long time, so hence the upgrades and service, but once started ran like a dream.
Engine oil and filters changed every 3000miles
New valley gasket (Just for info)
New steering pump (as I had the front stripped)
New fuel pressure unit and all set to the correct PSI
New in tank fuel pump, all new filters on the fuel system
New distributor, complete with new cap and rotor from RPI
New spark plugs NGK BPR6ES
New RPI amp, plus Bosch coil
New temp coolant sensor
New magncour leads
Timing set at 6degrees BTDC, and set up with a timing light, with vacuum hose disconnected in fact set up several times as I wasn’t happy with the first set up.
Base idle set with vacuum hoses blocked, 570rpm on the Rovergauge on the laptop, when vacuum hoses connected RPM is then sitting at 770rpm which sounds nice
No fault codes on the Rovergauge software when driving.
MAF out put voltages are ok as per diagnostic info found on this web site, and set at 1.5v due to the Adams ECU remapped.
TPS output voltage was high so I set the voltage as per the instructions, THIS was done last month before I changed all the parts. I plan to test voltage and adjust tomorrow but not sure if this is the fault?
After reading the long story above can anyone shed some light on my next course of action?
many many thanks in advance Ives