Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
05-17-2012, 08:38 PM | #1 | |
AF Newbie
Join Date: May 2012
Location: Wausau, Wisconsin
Posts: 24
Thanks: 9
Thanked 0 Times in 0 Posts
|
Runs Rough on Cold Start-Up
I have a 1998 Ford Windstar. I recently replaced all of the intake manifold gaskets (upper and lower), EGR valve, spark plugs, spark plug wires, and PCV valve. Now, when it sits overnight and is started for the first time in the morning, it revs way up (2K), then drops way down (500) and runs very rough. Then it will rev back up to 2k, then drop back down. It will do that maybe three times, then quit. If I hold the gas pedal at 1500 rpms for a minute or two, then it is fine; and will run fine the rest of the day. Any ideas?
|
|
05-17-2012, 09:21 PM | #2 | |
One Hot Shot
Join Date: Mar 2010
Location: Venice, Florida
Posts: 444
Thanks: 29
Thanked 28 Times in 27 Posts
|
Re: Runs Rough on Cold Start-Up
vacuum leak, IAC AND MAF. Make sure that all hoses are connected properly. Check that you plugged the MAF "mass air flow" and IAC "Idle Air Control " back in..
Do you have any DTC set? Last edited by FishFind; 05-17-2012 at 09:58 PM. |
|
The Following User Says Thank You to FishFind For This Useful Post: |
ajb0009 (05-18-2012)
|
05-17-2012, 09:30 PM | #3 | |
AF Enthusiast
Join Date: Nov 2007
Location: Muskoka
Posts: 825
Thanks: 2
Thanked 34 Times in 28 Posts
|
Re: Runs Rough on Cold Start-Up
well, vac leaks are always the suspect but if you say that after it's gone thru the warm up period it's fine, I'd be more inclined to look at your IAC. I'd be of the impression that if you have a vac leak that all of a sudden goes away, only to resurface when cold again, it likely isn't a vac leak..
__________________
----------- 2000 windstar 3.8 2010 honda pilot touring Muskoka Canada |
|
The Following User Says Thank You to northern piper For This Useful Post: |
ajb0009 (05-18-2012)
|
05-17-2012, 10:03 PM | #4 | ||
One Hot Shot
Join Date: Mar 2010
Location: Venice, Florida
Posts: 444
Thanks: 29
Thanked 28 Times in 27 Posts
|
Re: Runs Rough on Cold Start-Up
Quote:
Don't count the vac out just yet. Cold engine needs more fuel less air. Hot engine needs more air less fuel. |
||
The Following User Says Thank You to FishFind For This Useful Post: |
ajb0009 (05-18-2012)
|
05-18-2012, 06:37 AM | #5 | |
AF Newbie
Thread starter
Join Date: May 2012
Location: Wausau, Wisconsin
Posts: 24
Thanks: 9
Thanked 0 Times in 0 Posts
|
Re: Runs Rough on Cold Start-Up
No check engine light. No other issues at all other than just the first few minutes of a cold start-up. I was thinking vacuum too, but I have looked and looked. I have never had an issue with IAC before; when I had it off and replaced the gasket for it, it actually looked pretty clean inside. Thanks for the input everyone, I appreciate it.
|
|
05-18-2012, 08:36 AM | #6 | |
One Hot Shot
Join Date: Mar 2010
Location: Venice, Florida
Posts: 444
Thanks: 29
Thanked 28 Times in 27 Posts
|
Re: Runs Rough on Cold Start-Up
When the engine is running and you unplug the IAC you should see a difference in how it runs.
Here is a quick easy way to check for big vac leaks. http://www.youtube.com/watch?feature...&v=zMok2y05jNE |
|
|
POST REPLY TO THIS THREAD |
|
|