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Engine running very very poorly - ideas?
This is a discussion on Engine running very very poorly - ideas? within the General Help forums, part of the LSx Technical Help Section category; ...
08-14-2012, 10:38 PM #21
I edited a few posts because I kept calling it "closed" loop instead of open. Just for clarification....."open" loop is before the O2 feedback is being used and "closed" loop is using O2 feedback. The ect enable for closed loop varies a little by IAT temp but generally is 92°F.
08-14-2012, 10:46 PM #22
08-15-2012, 01:00 AM #23
the problem you would run into there is that the primaries on LT's are so long.....you don't want that sensor only reading 1 primary so it has to be in the collector. What sensor are you running and what codes are you seeing? The most common are switching and heater codes. I had those after going to headers. Went with bosch 13111 sensors and haven't had one since......that was 3-4 years ago. Firebirdjones also cured the same code issue by going to that sensor I believe but I'd let him answer that.
08-15-2012, 04:50 AM #24
08-15-2012, 02:46 PM #25
Last edited by SuperSSguy; 08-15-2012 at 03:04 PM.
09-04-2012, 11:57 AM #26
- Join Date
- Apr 2012
Thanks to everyone for your help. Thought I'd post an update.
I cleaned the MAF sensor, done my best to check all grounds/connectors, replaced both O2 sensors (I was very wrong about only having one sensor - it was just in a very well hidden spot and I found it when I got underneath). The problems persists....
I have moved onto problems with the fuel system. When I attach a fuel pressure gauge this runs at 65 psi when idling smoothly. But this can fluctuate quite noticeably, i.e. pulses between 65 - 45 psi. It was doing this when running badly. The high pressure pump makes a very odd noise whilst this happens making me beleive it is under strain.
I'll start with the filters first. Any other thoughts where a fuel problem could be occuring?
A couple of issues which may be related - a very strong smell of fuel - to the point where after a drive I need to change my clothes. I have spotted a very small leak from the stop cock before the low pressure filter but I doubt this is the cause. I initially thought this meant I was running rich/unburnt fuel - hence starting by changing the O2 sensors. Any thoughts as to how this may tie in? The PCM uses a Baker electronics rear O2 sensor bypass unit - could a faulty one of these cause this problem?
My father borrowed the car before this problem started and has now confessed putting diesel in it!!! Apparently this was about 5 litres and the full tank was drained and filled with the right stuff. Apparently getting the pipe in was a an ordeal - I wonder if something could have been dislodged inside the tank?? Seems to be a bit of a coincidence.
I've put some photo of my fuel layout below.
Fuel regulator - braided input hose from high pressure pump. Normal hose back to swirl pot
Low pressure pump - receives fuel from tank and pumps to swirl pot via filter
LOW PRESSURE PUMP.jpg
High pressure pump and filter - receives fuel from swirl pot then sends through filter before going to engine bay
high pressure pump.jpg
Swirl pot. Receives fuel from low pressure pump (via filter) and back from regulator. Fuel goes off to high pressure pump.
Last edited by cullywoo; 09-04-2012 at 12:07 PM.
09-04-2012, 07:40 PM #27
- Join Date
- Jan 2009
- Paterson/Ridgewood, NJ
Phantom Black Metallic
- 2004 GTO M6
I cannot remember if diesel causes the O-rings in the injectors to swell.
09-04-2012, 08:12 PM #28
how much was it ran after the diesel was discovered? That's assuming the tank wasn't bone dry before putting the diesel in there. The car won't run at all if it's on straight or close to straight diesel. I've never personally ran into that issue. I know it's been done which has always puzzled me how it's even possible. The diesel nozzle at a station is considerably larger than the opening to the tank. I can see the other way around happening and I know gas will destroy a diesel pretty quickly but I think once you get the diesel out of a gas burner it's no harm no foul really. You may want to check the plugs to make sure they're not fouled and run some injector cleaner through the car but other than that I can't really see it doing much harm.
09-05-2012, 09:57 AM #29
- Join Date
- Apr 2012
Thanks, the car wasn't run at all with diesel in, and tank drained dry. I doubt this is relevant. As you say a trace of diesel shouldn't cause too much of a problem.
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