i have a 86 iroc-z 305tpi auto that has a new motor with 7500 miles, i just noticed that when floored it will get to 3000rpm and wont pull all the way through 5000rpm. the car would pull up throught their before i dunno why it wont now, i tried revving it in nuetral and it still will only go to like 3000 rpm.

i checked the throttle linkage to make sure it was opening all the way. it is i believe.


eric

 

what happens then? the motor dies? or just wont rev anymore or what? try revving it via the throttle linkage.. can see if it is blocked by something

[This message has been edited by mtx28 (edited November 28, 2000).]

 

Is it like that only after warming up? Does the exhaust sound weird, like air blowing? It could be a plugged cat. or some othe exhaust restriction. I've had this happen to me before! If the throttle check doesn't turn up anything, this may be something to look at!

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Working on:
'84 Z28 LG4 305
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350
using primarily GMPP parts.
Block is in shop!

Awaiting results from all 8 ASE tests.

Starting to look like the Kicker poster child!

 

IT JUST WONT REV ANYMORE, i tried revving it via the throttle linkage and it still wouldnt rev anymore, if i shut the windows, the inside smells of gas, so maybe the catalyst is plugged, man you guys are good.

but keep postin other ideas in case it aint that

 

When you say it doesn't rev, what does that mean?

Does the car stall?

Does the RPM stay constant?

Does it laugh at you?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

It may be possible there is an ignition problem as well. If the timing is not advancing, or ignition is breaking up fuel will not burn correctly causing the smell of un-burnt fuel. Are you storing codes?

 

THE RPM STAYS CONSTANT, ........3000rpm

i dunno why, pops says the tranny aint shiftin right either, which i believe is true.

et

 

Broken valve spring?

 

I had the same prblem on my old TA the catalaytic converter had melted down,it had a weird sound out the exhaust thou,almost like whistling.So I took it off and took a long pry bar to the melted crap inside and hollowed it out ran like it never had after,must have been going on for a while

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89 FORMULA 350,WS6 SUSPENSION,FRESH 355 MOTOR,TCI 12" STREETFIGHTER,TRANSGO SHIFT KIT,3.70 GEARS,SLP REAR CONTROL ARMS/PANHARD,HOTCHKIS STB,FORMULA GP'S,FLOWMASTER EXHAUAST,58 MM BBK,MINIRAM INTAKE,ALL FREE MODS(HEADERS WAITING IN GARAGE)SLP 3/4",NO CATS,

 

I had thought of the timing also, but wanted to hear more details first. Since you engine is fairly new, it could be possible that the distributor came loose and the timing has retarded. May want to check it out!

When my converter went a few years ago, it left me stranded. By the time I got it towed to my dad's, it had cooled off and ran fine again long enough for me to get it a few miles to home. To test it, I warmed it up to where it was running bad, then hacked it up and put a hole in the front of the pipe attached to the converter (after the joint) and drove it. I made the hole small enough that it could be welded up if that wasn't the problem.



------------------
Working on:
'84 Z28 LG4 305
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350
using primarily GMPP parts.
Block is in shop!

Awaiting results from all 8 ASE tests.

Starting to look like the Kicker poster child!