unknown problem
10-23-2007, 03:26 PM
#1
2nd Gear Member
Thread Starter
Join Date: Jun 2007
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Posts: 220
unknown problem
Hello,
so my car has been annoying me lately. When it is cold and i start my car, once I try to go, it bogs really bad and the rpms drop to like 300. Then i kinda power threw it and once I shift into second theres a big backfire. The problem gets better when it warms up but it still does it. I took it to a mechanic and he fixed a coolant leak, put in a new thermastat (seperate problem) and he flushed the injectors. He said they were really dirty. He then checked the fuel pump pressure or w/e and said the number should be between 30-40 and mine is 32. So could that be the problem...a weak fuel pump? I noticed when I use to start my car it would start right up but now it takes about a second longer.
This problem is annoying. Im starting to wonder if I need mufflers to give it more backpressure.
so my car has been annoying me lately. When it is cold and i start my car, once I try to go, it bogs really bad and the rpms drop to like 300. Then i kinda power threw it and once I shift into second theres a big backfire. The problem gets better when it warms up but it still does it. I took it to a mechanic and he fixed a coolant leak, put in a new thermastat (seperate problem) and he flushed the injectors. He said they were really dirty. He then checked the fuel pump pressure or w/e and said the number should be between 30-40 and mine is 32. So could that be the problem...a weak fuel pump? I noticed when I use to start my car it would start right up but now it takes about a second longer.
This problem is annoying. Im starting to wonder if I need mufflers to give it more backpressure.
10-23-2007, 06:27 PM
#2
5th Gear Member
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
RE: unknown problem
ORIGINAL: bmennen07
Hello,
so my car has been annoying me lately. When it is cold and i start my car, once I try to go, it bogs really bad and the rpms drop to like 300. Then i kinda power threw it and once I shift into second theres a big backfire. The problem gets better when it warms up but it still does it. I took it to a mechanic and he fixed a coolant leak, put in a new thermastat (seperate problem) and he flushed the injectors. He said they were really dirty. He then checked the fuel pump pressure or w/e and said the number should be between 30-40 and mine is 32. So could that be the problem...a weak fuel pump? I noticed when I use to start my car it would start right up but now it takes about a second longer.
This problem is annoying. Im starting to wonder if I need mufflers to give it more backpressure.
Hello,
so my car has been annoying me lately. When it is cold and i start my car, once I try to go, it bogs really bad and the rpms drop to like 300. Then i kinda power threw it and once I shift into second theres a big backfire. The problem gets better when it warms up but it still does it. I took it to a mechanic and he fixed a coolant leak, put in a new thermastat (seperate problem) and he flushed the injectors. He said they were really dirty. He then checked the fuel pump pressure or w/e and said the number should be between 30-40 and mine is 32. So could that be the problem...a weak fuel pump? I noticed when I use to start my car it would start right up but now it takes about a second longer.
This problem is annoying. Im starting to wonder if I need mufflers to give it more backpressure.
Change your fuel filter.
10-24-2007, 04:28 PM
#6
1st Gear Member
Join Date: Oct 2006
Location: Dallas, TX
Posts: 61
RE: unknown problem
Sorry, I'm new to 5.0's, but what do they use for a cold-start bypass system? Backfiring is caused by running too rich, which would explain why you're bogging as well (improper air to fuel ratio). If it goes away when the engine is warm then it's pretty much related to a cold start air bypass system or cold start emissions system.
Now if you're talking about warm and cold WEATHER then it could be something like an AAT (Ambient Air Temperature) or IAT (Intake Air Temperature) sensor giving bad information.
Now if you're talking about warm and cold WEATHER then it could be something like an AAT (Ambient Air Temperature) or IAT (Intake Air Temperature) sensor giving bad information.
10-24-2007, 05:56 PM
#7
5th Gear Member
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
RE: unknown problem
Lets start over, when did this happen?
First ownership?
After mechanic visit?
When you punch the gas , does it take alot of time for the rpms to pick up? or just act as if you didnt hit the gas at all?
Check engine light ever come on?
Start by checking for stored codes, http://fordfuelinjection.com/?p=13
First ownership?
After mechanic visit?
When you punch the gas , does it take alot of time for the rpms to pick up? or just act as if you didnt hit the gas at all?
Check engine light ever come on?
Start by checking for stored codes, http://fordfuelinjection.com/?p=13
10-24-2007, 06:57 PM
#8
2nd Gear Member
Thread Starter
Join Date: Jun 2007
Location:
Posts: 220
RE: unknown problem
this happened about 2 weeks after I got my exhaust done. I am the second owner...first guy was a older man that had a complete tune up before he sold it to me.
After mechanic visit it still did it but not as bad as before the injectors were cleaned. I also had a new thermostat and gasket put in. When I punch it, its alive and kicking like no other. Just when the rpm's are low it bogs. I remember when I first got the car id shift into 5th instead of 3rd on accident and it would still drive nicely. Wouldnt dare try that now. Check engine light has NEVER been on.
The mechanic pulled codes and got nothing. I will clean the MAF and check the fuel pressure regulator tonight as someone told me to try it.
thanks for the help man.
idk if it would be a sensor cause the CEL light would come on correct?
After mechanic visit it still did it but not as bad as before the injectors were cleaned. I also had a new thermostat and gasket put in. When I punch it, its alive and kicking like no other. Just when the rpm's are low it bogs. I remember when I first got the car id shift into 5th instead of 3rd on accident and it would still drive nicely. Wouldnt dare try that now. Check engine light has NEVER been on.
The mechanic pulled codes and got nothing. I will clean the MAF and check the fuel pressure regulator tonight as someone told me to try it.
thanks for the help man.
idk if it would be a sensor cause the CEL light would come on correct?
10-24-2007, 08:51 PM
#9
2nd Gear Member
Thread Starter
Join Date: Jun 2007
Location:
Posts: 220
RE: unknown problem
ok i checked the fuel pressure regulator. Looks new and in good condition. I couldnt take it off cause it was stuck for some reason but i took off the 2 bolts and gas started dripping out.
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