The 4.9 working out bugs

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   So my 4.9 is running like a champ and the fiero drives 

good. I have some strange little bugs though.

Bug 1: the tach and speedo are off, like i knew they 

would be, but my question is for the tach do i just 

bypass the filter or get a different one? and for the 

speedo how do i hook it up?? i have the two wires from 

vss going to the computer and then i have the 4000ppm ecm 

output going through the converter and then to the yellow 

speedo wire on the 203 connector, and i have the 

purple/white 203 wire grounded. i though this was it but 

the speedo registers about 5kph when im going 30 and 

10kph when im going 40 45. what did i do wrong? 

Bug 2: Ok so im running the 4.9 with a centerforce clutch 

stage 2 i believe, slightly used, and ive got the muncie 

4 speed. So my problem is every time i shift into a gear 

and am accelerating but not hard, a couple seconds or a 

certain amount of rpms later there is this little stutter 

or hesitation from the engine. Its very slight like one 

cylinder didnt fire or something, but its not a misfire 

because it happeneds the same length into every gear and 

consistently happeneds when hot, when its cold it doesnt 

do it nearly as much. any ideas?

Bug 3: The check engine light comes on about 45 sec after 

turning the car on, but when i plug my computer in to 

read codes the light goes off and there are no codes, so 

if the light is for a code then i cant read it because 

the second i plug the obd1 in it turns off.  

Bug 4: when the car gets relatively warmed up, the idle  

changes from a steady 1050rpm to to going back and forth 

from 1100 down to 850 and back every second, also i found 

that this starts happening when block learn mode is 

engaged says my computer, and the computer says it is 

alternating from rich to lean and back corresponding with 

the idle. Is this just the computer sorting out the fuel 

ratio and not keeping up with the cam? (282)

Thanks!!!!  

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orange Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 September 2010 Location: United States Status: Offline Points: 106	Post Options Post Reply Quote orange Report Post Quote Reply Topic: The 4.9 working out bugs Posted: 17 February 2011 at 7:31pm
	So my 4.9 is running like a champ and the fiero drives good. I have some strange little bugs though. Bug 1: the tach and speedo are off, like i knew they would be, but my question is for the tach do i just bypass the filter or get a different one? and for the speedo how do i hook it up?? i have the two wires from vss going to the computer and then i have the 4000ppm ecm output going through the converter and then to the yellow speedo wire on the 203 connector, and i have the purple/white 203 wire grounded. i though this was it but the speedo registers about 5kph when im going 30 and 10kph when im going 40 45. what did i do wrong? Bug 2: Ok so im running the 4.9 with a centerforce clutch stage 2 i believe, slightly used, and ive got the muncie 4 speed. So my problem is every time i shift into a gear and am accelerating but not hard, a couple seconds or a certain amount of rpms later there is this little stutter or hesitation from the engine. Its very slight like one cylinder didnt fire or something, but its not a misfire because it happeneds the same length into every gear and consistently happeneds when hot, when its cold it doesnt do it nearly as much. any ideas? Bug 3: The check engine light comes on about 45 sec after turning the car on, but when i plug my computer in to read codes the light goes off and there are no codes, so if the light is for a code then i cant read it because the second i plug the obd1 in it turns off. Bug 4: when the car gets relatively warmed up, the idle changes from a steady 1050rpm to to going back and forth from 1100 down to 850 and back every second, also i found that this starts happening when block learn mode is engaged says my computer, and the computer says it is alternating from rich to lean and back corresponding with the idle. Is this just the computer sorting out the fuel ratio and not keeping up with the cam? (282) Thanks!!!!
	Orange 4.9

orange Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 September 2010 Location: United States Status: Offline Points: 106	Post Options Post Reply Quote orange Report Post Quote Reply Posted: 21 February 2011 at 9:24am
	Anyone?
	Orange 4.9

Nexus Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 06 January 2011 Location: Canada Status: Offline Points: 111	Post Options Post Reply Quote Nexus Report Post Quote Reply Posted: 23 February 2011 at 5:38pm
	Wish I could help but I know nothing!!! Sorry!!
	Charlie 84 SE

CFoss Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 February 2007 Location: Canada Status: Offline Points: 580	Post Options Post Reply Quote CFoss Report Post Quote Reply Posted: 23 February 2011 at 7:16pm
	Tach: Playing with the tach filter will acheive nothing. Read this: http://www.westcoastfieros.com/forum/forum_posts.asp?TID=180 2&KW=cfoss My 1227730 speedo connection is like this and works well. It may work for your application as well: As for the rest of it, I'm not much help. For bug4, look for a vaccuum leak, or clogged iac valve, that sort of thing. It could be the cam. Most try going a bit richer and advance the timing a couple of degrees to smooth it out. Chay
	86 SE 3.4

orange Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 September 2010 Location: United States Status: Offline Points: 106	Post Options Post Reply Quote orange Report Post Quote Reply Posted: 23 February 2011 at 8:22pm
	thanks for the responce! but the link wont work and it says error when i copy past it. could you maybe direct me to the page a different way?
	Orange 4.9

orange Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 September 2010 Location: United States Status: Offline Points: 106	Post Options Post Reply Quote orange Report Post Quote Reply Posted: 23 February 2011 at 8:54pm
	Nevermind i got the link to work
	Orange 4.9