rough start, then runs fine. No codes
Thread Starter
Member
Joined: 07-09-2009
Posts: 32
From: Oregon
Well, here I am again requesting your help.
To recap: the car will usually start and run, but really rough at first. This only happens when first starting it. After we drive and stop, it starts with no issues.
I have:
Replaced the battery with a OEM fit Die Hard Gold battery
Replaced the spark plugs with the OEM AC Delco plugs
Used the CDC MAF spray and thoroughly cleaned the MAF
Cleaned the throttle body with CDC TB cleaner
Did a battery lobotomy.
And it still starts rough in fits and starts then smooth out and run fine.
Their are no codes
So what is next??
To recap: the car will usually start and run, but really rough at first. This only happens when first starting it. After we drive and stop, it starts with no issues.
I have:
Replaced the battery with a OEM fit Die Hard Gold battery
Replaced the spark plugs with the OEM AC Delco plugs
Used the CDC MAF spray and thoroughly cleaned the MAF
Cleaned the throttle body with CDC TB cleaner
Did a battery lobotomy.
And it still starts rough in fits and starts then smooth out and run fine.
Their are no codes
So what is next??
Thread Starter
Member
Joined: 07-09-2009
Posts: 32
From: Oregon
Yes, I installed the 41-103 plugs.
I have no way to do the fuel pressure test. o I guess I should now tke it to shop for that?
Wouldn't low fuel pressure affect the driving too, not just the start up?
I have no way to do the fuel pressure test. o I guess I should now tke it to shop for that?
Wouldn't low fuel pressure affect the driving too, not just the start up?
Premium Member
Joined: 03-12-2017
Posts: 1,250
From: Phoenix
Low fuel pressure at start-up can be caused by a leaky check valve in the fuel pump.
This will not effect driving as the fuel pump itself is providing the correct pressure.
A fuel pressure gauge can be rented from AZ.
This will not effect driving as the fuel pump itself is providing the correct pressure.
A fuel pressure gauge can be rented from AZ.
Thread Starter
Member
Joined: 07-09-2009
Posts: 32
From: Oregon
I'll do whatever you say, but this is the ongoing problem I started with. I have done all of your recommended fixes and was asking what to do next. You all have been very helpful, so I don't want to cause a problem. I'm not a computer guy, don't do social media at all, so these threads and posts are all new to me. Just trying to fix my car 
Administrator
Joined: 10-13-2011
Posts: 40,082
From: Welland,Ont Canada
Then stay with this thread, that’s ok!
some parts palaces will require you leave the parking lot to test your car, some have area’s to check out your car with their loaner tools.
fuel pressure test is pretty easy, but if your nervous, take it to a shop you know and trust!
some parts palaces will require you leave the parking lot to test your car, some have area’s to check out your car with their loaner tools.
fuel pressure test is pretty easy, but if your nervous, take it to a shop you know and trust!
