| Author |
Message |
stacy o'blenes (Stacy)
| | Posted on Saturday, November 17, 2001 - 1:47 pm: | |
Herbert,
You were right. It is the points in the front bank that are shot. Time for an after market ignition system.
Thanks for your help,
Stacy |
stacy o'blenes (Stacy)
| | Posted on Thursday, November 15, 2001 - 3:14 pm: | |
Low,
What are you refering to as standoff's. Do you mean the spark plug extensions?
David,
I will check the ehxaust headers this weekend. The air pump is gone, T think the injectors are just plugged off.
Thanks, |
Low Kai Chin (Speeddemon)
| | Posted on Thursday, November 15, 2001 - 11:17 am: | |
I have the exact same problem, at the same rpm range! I found that it was due to my ignition system. In my case, I traced it to the standoffs! After replacing them, the problem magically went away. |
David Jones (Dave)
| | Posted on Thursday, November 15, 2001 - 11:08 am: | |
OK Stacy,
I'll put my 2 cents worth in....
"The louder popping sounds primarily come when I ease off the throttle, I think from the exhaust."
That usually indicates an exhaust leak.
Check your header bolts...
Also, do you have your air pumps still hooked up but the belts removed? |
magoo (Magoo)
| | Posted on Tuesday, November 13, 2001 - 9:27 pm: | |
Stacey, It is real hard to tell from this point but I wonder if your microswitch is out of adjustment? If you have your owners manual the adjustment is described under microswitch adjusting. |
stacy o'blenes (Stacy)
| | Posted on Tuesday, November 13, 2001 - 7:47 pm: | |
Here is an update.
I replaced the plugs (NGK), one extension, wires, and installed Accell high output coils. While changing the wires I noticed a crack in the distributor cap from the front bank and replaced it ($$). Unfortunately the problem still persists. I hear a pop or snap when I blip the throttle (I think in the intake manifold)and backfiring when I let off the throttle. I seems to be worse when the car warms up. I am going to test the condensers next.
I am considering converting to a breakerless ignition system but I am starting to wonder if I am dealing with a carb problem.
Any suggestions about how to sort this out?
Thank for all the advice so far. |
Charles Byrd (Vogel)
| | Posted on Friday, November 02, 2001 - 12:07 pm: | |
I haven't been on the site in a while, but I have had the same problem, but it seems to have been related to the fuse box problem that I had, and was helped with on this site. I did replace the plugs on my 77 308 GTB, and that seemed to help for a while, but when I rewired the fuse box as per instructions, the backfiring went away. I believe I was getting late firing from the ignition, or the fuel pump was pulsating instead of a constant flow. Maybe your problem will be this easy too. Good Luck. |
Herbert Edward Gault (Irfgt)
| | Posted on Monday, October 22, 2001 - 10:12 pm: | |
Since the tach works from the front bank ignition unit,and your tach is jumping, I would suspect a condenser or points going bad. Probably a good time to update to an electronic ignition system, especially since some of the condensors are discontinued and hard to find and EXPENSIVE versus an aftermarket ignition. |
magoo (Magoo)
| | Posted on Monday, October 22, 2001 - 9:56 pm: | |
Stacy calm down. Check out the ignition first. Coils, points,etc.. That is probably where your problem is. Check the small things first. |
stacy o'blenes (Stacy)
| | Posted on Monday, October 22, 2001 - 7:56 pm: | |
I pulled some plugs today. The rear bank looks pretty good with tan/brown redisue on the ceramic. The front bank were quite black/sooty.
I spent a lot of time looking for arcing from the wires but could not see any.
When I blip the throttle I hear a snapping that seems to be coming from under the air cleaner. The louder popping sounds primarily come when I ease off the throttle, I think from the exhaust.
I think I will replace the plugs and get the hotter coils as a next step.
Does anyone think this could be a carb problem rather than an ignition problem? What about something nasty like a bad valve?
Thanks for all your input, I will keep you posted. |
Herbert Edward Gault (Irfgt)
| | Posted on Monday, October 22, 2001 - 4:16 pm: | |
A timing belt that has jumped usually will cause a loss of power but usually not a backfire. You probably have an ignition component breaking down. |
kelly vince (Tofosi1)
| | Posted on Monday, October 22, 2001 - 1:00 pm: | |
I have heard that if she starts missing and backfireing the exhaust timing belt may have slipped and is one tooth out of line. Being that you are hearing clicking, backfire and missing. I would look there first. Sorry, I know that's a really big look too.
Good luck. |
Neville Pugh (Nev_Pugh)
| | Posted on Monday, October 22, 2001 - 7:16 am: | |
Also, do more than check the wired visually ..... I had a faulty wire which caused a similar misfire (worse when cold) .... the problem wire looked fine, when when hooked up to an ohm meter and wiggled lots, it went from near 0 ohms to inifinate ohms ! (in other words there was a break in the wire which only showed up when the wire was moved vigorously) |
James Angle (Jimbo74)
| | Posted on Sunday, October 21, 2001 - 3:08 am: | |
Stacy
Check for stray spark. You could have a slit in a plug wire somewhere and it could be arcing off of the block, or anywhere else. It's easiest to check for in a dark garage or at night. You'll know when you lift the hood up. |
magoo (Magoo)
| | Posted on Saturday, October 20, 2001 - 11:16 pm: | |
Stacey, Check your email. I have already contacted you. |
stacy o'blenes (Stacy)
| | Posted on Saturday, October 20, 2001 - 5:04 pm: | |
magoo,
What did you gap the plugs at? Does your car have points or electronic ignition?
Thanks,
Stacy |
magoo (Magoo)
| | Posted on Saturday, October 20, 2001 - 4:10 pm: | |
Stacy, It could be your coil,[coils]. If so I used the Accel 52,000 volts @ and have been very pleased with them. The part no. is 8140. Along with that I used the NGKBPR6EVK plugs with a wider gap. It has solved a lot of problems for me including the exhaust being too rich. |
stacy o'blenes (Stacy)
| | Posted on Saturday, October 20, 2001 - 3:10 pm: | |
78 308 gtb (carbs, points) has been running well. Two days ago I noticed the engine was missing on acceleration around 3-4000 rpm (loss of power, backfiring in exhaust, and I was hearing a snapping or clicking sound seemed to be coming from over my right shoulder). The problem seems to come and go although it is getting more constant. The car starts and idles well but the tach needle seems to flicker which I hadn't noticed before.
My first step has been to look at the wires and extensions. I found one extension that had the spring clip busted off which I replaced. The wires are not that old. The distributor caps look OK. The coils look like the originals.
Does this sound like an ignition problem to you?
Some people have talked about replacing the coils with Accel 42 kv coils. Does anyone know the accel part number?
Thank you in advance for your insight. |
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