idles (barely) but won't rev at all???

[jadedinpa]

my 86 5.0 coupe is acting up. idles (barely)- sounds like it's running on 5 or 6 cyls. when i press the throttle it acts like it wants to shut off. it won't rev, it just stays at idle. replaced TPS, TFI, cap, rotor, plugs. reset computer, no change.

any suggestions?

 

[ECU5.0]

im sure you did it with all the other things you replaced but the only thing that comes to mind is a new coil. it could also be bad fuel injectors....did you check all of those. if youve replaced everything else than that would be next culprit

 

[88stangmangt]

ooh boy since it is a 86 it should be F.I sound like it isnt geting much fuel i would try there is it still the 86 fuel pump? if so you have got lucky it lasted this long.

 

[jadedinpa]

tried a different coil, no change.

 

[jadedinpa]

fuel pump was replaced not long before i bought the car.

 

[ECU5.0]

whoops...didnt see it was an 86...my bad....

 

[88stangmangt]

i would still check to see what the F/p is.

 

[jadedinpa]

i would still check to see what the F/p is.

it's on my to-do list.

 

[Mike86Stang]

I had the same problem when I left my MAF disconnected but I dunno if you converted to mass air or not. SOoooo... I'd say check for vac. leaks, or try some starter fluid through the trottle body to see if it's fuel related (A/F ratio)

Mike

 

[jadedinpa]

speed density i'm not going mass air (staying mostly stock)

i've heard that speed density cars are very dependant on vacuum, but i don't HEAR any vacuum leaks ( not to say there aren't any, there very well could be ) so i'm not sure what's up. i still have to do a fuel pressure test and a compression test, but first need to get the tools to do so. i'm learning as i go, and when it breaks it's a great opportunity to learn something lol

 

[jadedinpa]

replaced the fuel filter. no change. ttt

 

[93tealstang]

Maybe you could try pulling codes just to see if anything shows up.

 

[gold73fastback]

I had the same problem with my car, which is carburated.
Somehow oil was getting inside my distributor cap (bad seal on the shaft?) and spraying a mist around in there, I think it was causing the spark to go to ground.

also, check the positive wire on ur coil to make sure it's getting 12 V. if u don't have a voltmeter, connect a jumper wire from the positive battery terminal to the positive side of the coil and see if that helps.

 

[jadedinpa]

i just got a code reader, i'm going to see what that reveals. beyond that, right now i'm leaning towards clogged cats....

 

[shorty1993]

has the motor been down. my boys camaro did the same exact same thing that you are describing, timing was 180 out. just a thought, distributor gear

 

[jadedinpa]

dizzy gear looks fine. i do need to check the timing.....

 

[MatthewP]

It sounds like a timing problem to me. Make sure you pull the short plug when checking base timing.

-Matthew

 

[jadedinpa]

UPDATE!!!!

i ran the thing long enough to get the drivers side cat to glow BRIGHT RED. methinks it's clogged. can i get a hallelujah?

 

[jadedinpa]

update of my update...... the cats weren't clogged. the pip module in the dizzy was bad. swapped out the dizzy and it's running like a champ!

 

[sixty9boss302]

jadedinpa - Can you tell me the process to swap the PIP module? It seems like you just got a whole new dizzy instead of just a new PIP. Let me know cuz i think this coulld be my problem also.