Timing belt or chain
01-15-2008, 10:07 PM
#1
Thread Starter
Join Date: Dec 2007
Posts: 20
Timing belt or chain
Alright I have a dumb question 
Does a 91 Mustang 5.0 have a timing belt or chain? What I see around the net is chain. I don't know. Reason I ask is because when I sit at a light or have it parked and in neutral the rpm's will gradually go up to 2000 then sometimes stay there or gradually come back down to 1000 all by itself. No gas input what so ever. What could possible issues be? I was told timing may be one, dirty injectors, I don't know. Any help would be great.
Does a 91 Mustang 5.0 have a timing belt or chain? What I see around the net is chain. I don't know. Reason I ask is because when I sit at a light or have it parked and in neutral the rpm's will gradually go up to 2000 then sometimes stay there or gradually come back down to 1000 all by itself. No gas input what so ever. What could possible issues be? I was told timing may be one, dirty injectors, I don't know. Any help would be great.
01-15-2008, 11:43 PM
#5
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
RE: Timing belt or chain
ORIGINAL: sardoghh65
Alright I have a dumb questionDoes a 91 Mustang 5.0 have a timing belt or chain? What I see around the net is chain. I don't know. Reason I ask is because when I sit at a light or have it parked and in neutral the rpm's will gradually go up to 2000 then sometimes stay there or gradually come back down to 1000 all by itself. No gas input what so ever. What could possible issues be? I was told timing may be one, dirty injectors, I don't know. Any help would be great.
Alright I have a dumb question
Does a 91 Mustang 5.0 have a timing belt or chain? What I see around the net is chain. I don't know. Reason I ask is because when I sit at a light or have it parked and in neutral the rpm's will gradually go up to 2000 then sometimes stay there or gradually come back down to 1000 all by itself. No gas input what so ever. What could possible issues be? I was told timing may be one, dirty injectors, I don't know. Any help would be great.
Please bear with me...
01-16-2008, 05:36 PM
#8
Thread Starter
Join Date: Dec 2007
Posts: 20
RE: Timing belt or chain
Okay I found out it's not the MAF. I cleaned it, put it back together and then after running it alittle while it started doing it again. This time not all the way to 2000. Tommorrow is the idle air control. Thanks greenstreak9205 for the heads up.
Any ideas if this doesn't work? I'm trying to think of where to begin looking for a vacuum leak. Thanks in advance.
Any ideas if this doesn't work? I'm trying to think of where to begin looking for a vacuum leak. Thanks in advance.
01-16-2008, 06:14 PM
#9
2nd Gear Member
Join Date: Aug 2007
Location: Issaquah, WA
Posts: 154
RE: Timing belt or chain
how gradual do they move is it really slow or quick? im definately going to lean towards it being the iacv my car was loping slightly when i got iti took the intake hose off and the inside of the TB was covered in carbon soi bought a can of that throttle body cleaner and cleaned it all up really well especially the IACV it had alot of carbon in it and now it idles awesome