Last post on May 23, 2013 at 8:08 AM
You are in the Saturn S-Series
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Saturn S-Series, Auto Repair, Sedan
#45 of 235 hesitates on acceleration
Nov 12, 2007 (10:19 pm)
1996 Saturn 1.9L
On acceleration from low rpm to higher rpm the engine hesitates (coughs).
When the throttle is held steady there is no noticeable problem, but once you release the throttle and begin to accelerate you get a hesitation.
I have a cruise control that it will not stay on because of the hesitation. The cruise control shuts off after you release the throttle.
I have a new ignition, new air cleaner, new spark plugs, new engine temperature sensor, new map sensor, new throttle position sensor, new spark plug wires.
#46 of 235 Re: hesitates on acceleration [helpbingo]
Nov 13, 2007 (6:07 am)
Is your check engine light on ?
If so you need to go to your area parts store to have your codes checked. 1996 Vehicles and on have OBD2 “ On Board Diagnoses”. That will capture any misfires you may have going on with your vehicle. Wright down all information before clearing.
#47 of 235 Re: hesitates on acceleration [sattech]
Nov 13, 2007 (10:51 am)
I have no faults on the OBD2. The only fault I had was when I took the sensor plug out and ran it to see if there was a difference and there was none. Plugged it back in and cleared the fault.
I have an OBD2 scan tool by AUTOTERRA for Palm OS.
I took the EGR VALVE off today and it was clean at the pinnacle and around the port on both the cylinder head side and the valve side.
I did spray it with brake cleaner and scrubbed with a tooth brush. All the came off was a little bit of black. The pinnacle moved freely before and after treatment.
Reinstalled it and torqued the bolt and nut. Started it up and it ran. I am going to work soon and report on any change if any.
The EGR has 100,000+ Kms on it.
#48 of 235 Re: hesitates on acceleration [helpbingo]
Nov 14, 2007 (10:21 pm)
There was no difference in performance after cleaning the EGR Valve.
#49 of 235 Re: hesitates on acceleration [helpbingo]
Nov 15, 2007 (6:00 am)
If your sure that the EGR valve is fine, unplug the valve and drive the vehicle. The engine light will come on but you understand why. See if it still hesitates. Driving under a load your testing the performance of the secondary ignition.
If it still does.
Start at the plugs look at them and see what color they are, lightly pepper looking is fine but black is not. Check your fireing order over. Plug gap .040. One other thing you can do is remove all spark plug wires from the coils and put them out of the way. Look at the coil towers and have someone crank the engine over. See if they arck together 4-1,2-3. If not you may have a bad coil.
#50 of 235 Re: hesitates on acceleration [sattech]
Nov 19, 2007 (9:35 am)
I unplugged the EGR and drove the car with no change. I got the engine light on and reset it.
I checked the spark plugs and they are white. They are bosch copper plus gapped at .050.
I have Nology capacitor discharge plug wires, AEM cold air intake, a ceramic coated exhaust, and a flow thru cat and muffler, as well as a Complete MSD Ignition.
I am not comfortable with shorting the coils.
But I have run on the stock ignition and have had the same problem.
I have changed the stock coils on the same stock ignition module and had the same problem.
I have changed the stock ignition module and run the stock coils and and MSD coils and had the same problem.
I have changed spark pug wires and had the same problem.
#51 of 235 Re: hesitates on acceleration [helpbingo]
Nov 19, 2007 (9:40 am)
One other thing I have noticed is that the hesitation always starts after the temperature gauge gets to normal operating temperature.
#52 of 235 Re: hesitates on acceleration [helpbingo]
Nov 19, 2007 (9:54 am)
Correction ---- The spark plugs I am using are Bosch Super with copper electrode.
I have changed the plugs back to the stock AC Delco and have the same problem with hesitation.
#53 of 235 Re: hesitates on acceleration [helpbingo]
Nov 19, 2007 (10:23 am)
After a closer look a the spark plugs the outer electrode is white on top, then going gray to black towards the threads.
The sides of the outer electrode are gray, and the under side of the outer electrode is gray.
The center electrode insulator is white half way around and black the on other half.
The face of the plug that circles the center electrode is black. The center electrode is gray with a small amount of light gray deposit on it.
Nov 19, 2007 (6:08 pm)
i have a 96 saturan sl and just found out a anitfreeze leak near top of or in front of rad does any 1 no any thing about this