Adnan
08-06-2007, 05:56 PM
Hi,
Last week I had shared my car's odd behavior with you all. To recap, she starts fine cold, or within five minutes of shutdown but give her twenty to thirty minutes and she isn't happy about it.
I added a fuel line check valve per Bruno's site and for good measure, replaced the fuel filter. All electricals seem fine. So far, I can get her going with extended cranking but the idle is rough. Yesterday, I added some throttle and after a few seconds, she smoothed out and purred like normal after that. Flooding?
Leaky injector? If that's the case, she should not start when cold since the system has lost fuel pressure, right? If one injector is leaking, won't the engine at least start with five cylinders? That first time, she refused to fire at all.
Jeff, to your question, the roughness only lasts a few seconds and power is perfect when running normally. No codes are set. Is there an easy test for injectors or do I need to pull the entire fuel rail? Do those Mustang injectors drop right in (I have a set at hand) without requiring DME changes?
Dukester has suggested that the pressure relief valve diaphragm may have ruptured; I'll check that out tonight.
Any other ideas?
Many thanks,
Adnan
'91 535i
Last week I had shared my car's odd behavior with you all. To recap, she starts fine cold, or within five minutes of shutdown but give her twenty to thirty minutes and she isn't happy about it.
I added a fuel line check valve per Bruno's site and for good measure, replaced the fuel filter. All electricals seem fine. So far, I can get her going with extended cranking but the idle is rough. Yesterday, I added some throttle and after a few seconds, she smoothed out and purred like normal after that. Flooding?
Leaky injector? If that's the case, she should not start when cold since the system has lost fuel pressure, right? If one injector is leaking, won't the engine at least start with five cylinders? That first time, she refused to fire at all.
Jeff, to your question, the roughness only lasts a few seconds and power is perfect when running normally. No codes are set. Is there an easy test for injectors or do I need to pull the entire fuel rail? Do those Mustang injectors drop right in (I have a set at hand) without requiring DME changes?
Dukester has suggested that the pressure relief valve diaphragm may have ruptured; I'll check that out tonight.
Any other ideas?
Many thanks,
Adnan
'91 535i