4wd Cosworth Map Sensor Voltage
Thread Starter
Advanced PassionFord User
Joined: Jun 2003
Posts: 2,322
Likes: 14
From: Sevenoaks
4wd Cosworth Map Sensor Voltage
Finally got around to playing with the cossie again.
I’m getting bad over fueling on idle and it’s really lumpy when reved. Plugs soot up within 30 secs of running.
it’s a 2 bar map sensor and im seeing 2.14v ignition on (book says 2.2 so that’s okay). At idle it’s around 1v and will increase when reved but erratic and jumpy. Book says should be 0.25 to 0.6v at idle. Could this difference of 0.4v cause my overfueling? I have literally changed everything else except the MAP sensor.
(I’ve test across ECU pin 11 (ground) and pin 15 (output voltage). Input voltage at 30 is 4.94v so that’s fine as should be 5v)
Cheers in advance
I’m getting bad over fueling on idle and it’s really lumpy when reved. Plugs soot up within 30 secs of running.
it’s a 2 bar map sensor and im seeing 2.14v ignition on (book says 2.2 so that’s okay). At idle it’s around 1v and will increase when reved but erratic and jumpy. Book says should be 0.25 to 0.6v at idle. Could this difference of 0.4v cause my overfueling? I have literally changed everything else except the MAP sensor.
(I’ve test across ECU pin 11 (ground) and pin 15 (output voltage). Input voltage at 30 is 4.94v so that’s fine as should be 5v)
Cheers in advance
Thread Starter
Advanced PassionFord User
Joined: Jun 2003
Posts: 2,322
Likes: 14
From: Sevenoaks
Hi, yes it was 3.5 bar at the rail. Also new coil, ignition amp, distributor cap and rotor, plugs, CTS, CPS, phase, ACT. Also tested TPS and was fine. MAP is the only sensor I haven’t physically changed.
Virgin
Joined: Nov 2022
Posts: 14
Likes: 1
From: Ta165qh
Hi Jim,
Just a quick one, if you haven’t cured this yet, I had the same issue. Take the vacuum pipe off the fuel pressure regulator (the one which joins onto the intake manifold opposite cylinder 3), and start the car, if you’ve got fuel coming out of the regulator then it’s had it, the diaphragm inside the regulator will be shot, and allowing fuel down the vacuum pipe and into the manifold, therefore bore washing the cylinders, just like mine was! Let me know how you get on.
Just a quick one, if you haven’t cured this yet, I had the same issue. Take the vacuum pipe off the fuel pressure regulator (the one which joins onto the intake manifold opposite cylinder 3), and start the car, if you’ve got fuel coming out of the regulator then it’s had it, the diaphragm inside the regulator will be shot, and allowing fuel down the vacuum pipe and into the manifold, therefore bore washing the cylinders, just like mine was! Let me know how you get on.
Thread Starter
Advanced PassionFord User
Joined: Jun 2003
Posts: 2,322
Likes: 14
From: Sevenoaks
Hi Jim,
Just a quick one, if you haven’t cured this yet, I had the same issue. Take the vacuum pipe off the fuel pressure regulator (the one which joins onto the intake manifold opposite cylinder 3), and start the car, if you’ve got fuel coming out of the regulator then it’s had it, the diaphragm inside the regulator will be shot, and allowing fuel down the vacuum pipe and into the manifold, therefore bore washing the cylinders, just like mine was! Let me know how you get on.
Just a quick one, if you haven’t cured this yet, I had the same issue. Take the vacuum pipe off the fuel pressure regulator (the one which joins onto the intake manifold opposite cylinder 3), and start the car, if you’ve got fuel coming out of the regulator then it’s had it, the diaphragm inside the regulator will be shot, and allowing fuel down the vacuum pipe and into the manifold, therefore bore washing the cylinders, just like mine was! Let me know how you get on.
Thread
Thread Starter
Forum
Replies
Last Post
MK2 COSWORTH
Technical help Q & A
15
Jun 26, 2012 12:08 PM