1986 Firebird engine loping at idle and low-mid rpms
04-26-2013, 12:22 PM
#1
Junior Member
Thread Starter
Join Date: Apr 2013
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
1986 Firebird engine loping at idle and low-mid rpms
My 1986 2.8l firebird is loping at idle and during acceleration, and when cruising at highway speeds. It feels kind of like its surging/loping and idle rpms bounce around by +/-200 rpms.
I just changed the drivers side manifold gasket, and had to remove the plug wires on that side, is it possible one of the drivers side plugs/wires is garbage?
What should I check first?
Thanks,
Jdvorsky
I just changed the drivers side manifold gasket, and had to remove the plug wires on that side, is it possible one of the drivers side plugs/wires is garbage?
What should I check first?
Thanks,
Jdvorsky
04-26-2013, 12:39 PM
#2
Junior Member
Join Date: Mar 2010
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Re: 1986 Firebird engine loping at idle and low-mid rpms
My car was doing the same thing. So, I changed the rotor,cap, wires, plugs, and cleaned the Idle Air Control Valve. I used Seafoam in the Intake Manifold. DIDN'T FIX IT...
Now I am changing the injectors, fuel filter, and cleaning the intake.
I hope your isn't as bad as mine...
Now I am changing the injectors, fuel filter, and cleaning the intake.
I hope your isn't as bad as mine...
04-26-2013, 07:38 PM
#3
Re: 1986 Firebird engine loping at idle and low-mid rpms
I'd look at the tune up parts & replace them if in question. Firing order is 123456. #1 is at the front pass side, #2 is at the front drivers side.
04-26-2013, 11:50 PM
#5
Junior Member
Thread Starter
Join Date: Apr 2013
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Re: 1986 Firebird engine loping at idle and low-mid rpms
Looked at the spark plug wires today after work and they were all garbage, 1 was sliced open and 2 broke taking them off.
So I changed those out and that fixed most of the problem, still idles a tiny bit rough but I think it was doing that before the huge idle+ driving problem happened.
So I changed those out and that fixed most of the problem, still idles a tiny bit rough but I think it was doing that before the huge idle+ driving problem happened.
Last edited by Jdvorsky; 04-27-2013 at 11:52 AM.
04-27-2013, 12:05 AM
#6
Supreme Member
iTrader: (1)
Join Date: Mar 2010
Location: Goose Creek, SC
Posts: 1,088
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1987 IROC-Z and 1988 Iroc-Z
Engine: 5.7 350 V8 and 5.0 305 V8
Transmission: 700R4 Automatic Transmission
Axle/Gears: 3.27 Posi
Re: 1986 Firebird engine loping at idle and low-mid rpms
Looked at the spark plugs today after work and they were all garbage, 1 was sliced open and 2 broke taking them off.
So I changed those out and that fixed most of the problem, still idles a tiny bit rough but I think it was doing that before the huge idle+ driving problem happened.
So I changed those out and that fixed most of the problem, still idles a tiny bit rough but I think it was doing that before the huge idle+ driving problem happened.
Thread
Thread Starter
Forum
Replies
Last Post
theshackle
Tech / General Engine
4
09-17-2020 08:26 AM
