surging while driving down the road

At1Maverick

New Member
Joined
Sep 7, 2008
Messages
25
Reaction score
0
Location
Las vegas, NV
I recently started driving 95 GT (auto) more often and I notice some surging during most driving condition, and during acceleration, I can hear a significant amount of spark knock too. It does have the surging idle issue going on as well. I have dropped the timing down to 10BTDC, I've also tried as much as 14BTDC- which didn't help, so it's back down to 10BTDC.

I've noticed that the dizzy is a little tight when I try to move it around trying to adjust timing. I've cleaned the MAF, checked FP and did plugs and wires, also a coolant temp sensor. No CEL or codes yet.
 

GT Rob

Well-Known Member
Joined
Nov 13, 2009
Messages
2,954
Reaction score
61
Location
Houston Texass
I had the same problem I changed everything I could even did the timing and that didn't help so a friend of mine did a compression test and found that I'm down on compression so going to replace my heads and while I'm there going to check my rings. Good luck with your car keep use up to date on what you find on yours. Oh yea mine is a 95 gt automatic also
 

At1Maverick

New Member
Joined
Sep 7, 2008
Messages
25
Reaction score
0
Location
Las vegas, NV
Just got done doing a compression, pretty much got 145psi across the board and I think my lowest was 142(cylinder #2), highest was 148(cylinder #5). Drove with a fuel pressure gauge attached to the windshield and everything seems to be normal as far as fp is concerned.
 

CC'S95GT

Post Whore
Joined
Apr 19, 2008
Messages
10,738
Reaction score
172
Location
Hampton ,Ga.
how old are the plugs, wires, cap, and rotor, and fuel filter? and did you put them on?
And just to make sure, did you set the timing with the spout out?
 

At1Maverick

New Member
Joined
Sep 7, 2008
Messages
25
Reaction score
0
Location
Las vegas, NV
Just did the tune-up myself not a month ago, so plugs, wires cap and rotor, fuel filter are all new. And the PIP is new as well. And yes, I did take the spout out to adjust timing.
 

GT Rob

Well-Known Member
Joined
Nov 13, 2009
Messages
2,954
Reaction score
61
Location
Houston Texass
i thought it was a vacuum also did a compression test and got 125psi all on the driver side but now where thinking it's a stuck valve
 

At1Maverick

New Member
Joined
Sep 7, 2008
Messages
25
Reaction score
0
Location
Las vegas, NV
So did I on mine, I had done a smoke machine test and nothing leaked. There's a noise coming from my CAI that I though was a vacuum leak from inside the fender. I'm about to do a leak down test to see if it's a valve train problem on mine.
 

At1Maverick

New Member
Joined
Sep 7, 2008
Messages
25
Reaction score
0
Location
Las vegas, NV
So,just an update. I replaced the distributor and seems like the problem is gone, no pinging and the surge/hesitation is gone, idles much better too.
 

the5.ohh

Legend
Joined
Oct 15, 2012
Messages
9,556
Reaction score
111
Location
Shaolin, NY
I had the same issue guys. Turned out to be a leaking O-Ring on an injector, so check your injectors. Also if your O2 sensors are OG, replace them.
 

Latest posts

Forum statistics

Threads
75,134
Messages
1,456,311
Members
13,688
Latest member
Pallgor

Members online

Top