Wave34
Petty Officer 1st Class
- Joined
- Oct 17, 2017
- Messages
- 341
I may need some help debugging this one.
My boat (Chaparral Signature 2004 with 5.7L Gi MPI) requires that I apply throttle to start.
Before it was doing that only with a cold engine, but now it does it also with a warmed up engine.
Once the engine is started, it idles fine, so I think I can rule out the IAC.
Engine has power. It goes on plane fast, cruises at 25mph/3300RPM or 30mph/3800RPM.
So, compression must be good (I didn't personally measured it, but the seller signed a paper saying he asked is mechanic to do it and it was 150 on all cylinders)
I tested the fuel pressures.
Key ON; the fuel pumps prime the lines for 2 seconds. Pressures are 10 psi low side and 55 psi high side.
With engine running; there is 55 psi on the high side.
I removed the FPR and found no paint inside, the screen/mesh is clean
I applied a vacuum with a manual pump to the FPR and it maintains the vacuum, so the diaphragm is good.
I checked for leaking injectors; they seem normal
Engine running; 55 psi
Stopped and delay of 15 sec = 48 psi
total delay of 30 sec = 45 psi
total delay of 45 sec = 41 psi
total delay of 60 sec = 38 psi
I measured the temperature sensor (2 pin one) with a cold engine, it was at 2600 ohms, which correspond to the ambiant temperature that day.
I know that on a cold start there is a puff of smoke coming out the exhaust. I think it is a sign of worn valve seals. The engine took 0.5L of oil for 25 hrs with plenty of 3500-3800 rpm travels. To me, it is not that bad.
I didn't check the distributor cap/plugs yet, since it never had a miss, but will do it when the boat is out of water.
In the meantime, I would like to know what people think my problem might be.
Is there a way of reading codes on a Volvo of my generation by only jumping two pins and installing a LED on the diag pin?
Thanks.
My boat (Chaparral Signature 2004 with 5.7L Gi MPI) requires that I apply throttle to start.
Before it was doing that only with a cold engine, but now it does it also with a warmed up engine.
Once the engine is started, it idles fine, so I think I can rule out the IAC.
Engine has power. It goes on plane fast, cruises at 25mph/3300RPM or 30mph/3800RPM.
So, compression must be good (I didn't personally measured it, but the seller signed a paper saying he asked is mechanic to do it and it was 150 on all cylinders)
I tested the fuel pressures.
Key ON; the fuel pumps prime the lines for 2 seconds. Pressures are 10 psi low side and 55 psi high side.
With engine running; there is 55 psi on the high side.
I removed the FPR and found no paint inside, the screen/mesh is clean
I applied a vacuum with a manual pump to the FPR and it maintains the vacuum, so the diaphragm is good.
I checked for leaking injectors; they seem normal
Engine running; 55 psi
Stopped and delay of 15 sec = 48 psi
total delay of 30 sec = 45 psi
total delay of 45 sec = 41 psi
total delay of 60 sec = 38 psi
I measured the temperature sensor (2 pin one) with a cold engine, it was at 2600 ohms, which correspond to the ambiant temperature that day.
I know that on a cold start there is a puff of smoke coming out the exhaust. I think it is a sign of worn valve seals. The engine took 0.5L of oil for 25 hrs with plenty of 3500-3800 rpm travels. To me, it is not that bad.
I didn't check the distributor cap/plugs yet, since it never had a miss, but will do it when the boat is out of water.
In the meantime, I would like to know what people think my problem might be.
Is there a way of reading codes on a Volvo of my generation by only jumping two pins and installing a LED on the diag pin?
Thanks.
