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  #1  
Old 10-11-2017, 03:29 PM
Geoffreybusuttilmalta Geoffreybusuttilmalta is offline
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Question engine occasionally misfiring

i need serious help on this. got a total engine rebuild. and it works very fine. with 100% compression on all cylinders etc... installed a new distributor too . but when checking the spark with a stroboscope. on each ht lead.. number 5 seems to not work continuously . and when touching / pressing the distributor cap .. it works .,.. and when not touching it it doesnt show any spark.. eventually sometimes while im drivin i m feeling the bird rattleing.. even the acellerator pedal... what could it be guys... ?

would really appreciate some help pls thanks from Malta EU. if maybe someone can help by finding me on facebook.. my name is geoffrey busuttil thanks againnn


geoffrey
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  #2  
Old 10-11-2017, 03:57 PM
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If it only fires when you press on the cap then it sounds like an issue between the rotor and the cap. Are your rotor and cap new and are you sure they are correct. It may be just poor quality replacement parts. I recommend buying the best quality parts you can find. Try cleaning the #5 contact on the underside of the cap. Maybe some plastic is overlapping it.

John
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Old 10-11-2017, 04:14 PM
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Also are your points adjusted to spec. Did you check it with a dwell meter. Don't assume with a new distributor right out of the box that the points are set correctly. That distributor fits multiple cars and every model has different gap settings.

John
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  #4  
Old 10-11-2017, 06:24 PM
Geoffreybusuttilmalta Geoffreybusuttilmalta is offline
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as what regards the gaps me and my mechanic checked that it is 0.4 mm ... which is at it should be ... as per distributor .... i bought it from birdsnest,.,. .. one thing ... could it be some wiring issue? ... because i was told by guys at work.. that it could be because of some wiring.......
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Old 10-11-2017, 06:45 PM
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If it fires when you push down on the cap then why would you suspect anything other than a distributor issue? If the guys at work think they know what the problem is then ask one of them to fix it for you. I'm giving you my opinion but if you think they know more than I do then I won't bother with this thread anymore.

John
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  #6  
Old 10-11-2017, 07:01 PM
Geoffreybusuttilmalta Geoffreybusuttilmalta is offline
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for being an administrator. sorry telling you that`s a very rude and bad tempered reply ... if everyone was an expert like you . this forum would be closed

just tryin to understand whats goin on man..
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Old 10-11-2017, 11:15 PM
Woobie Woobie is offline
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Quote:
Originally Posted by jopizz View Post
If it only fires when you press on the cap then it sounds like an issue between the rotor and the cap. Are your rotor and cap new and are you sure they are correct. It may be just poor quality replacement parts. I recommend buying the best quality parts you can find. Try cleaning the #5 contact on the underside of the cap. Maybe some plastic is overlapping it.

John
Yes I've witnessed the overlapping plastic and the cheap wobbly cap that would never seat properly and finally solved the issue with a cap/rotor that was warranteed for an extra long interval, maybe lifetime.

The op could do a continuity test on the #5 plug wire. Probably a waste of time.
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  #8  
Old 10-11-2017, 11:36 PM
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Quote:
Originally Posted by Woobie View Post
The op could do a continuity test on the #5 plug wire. Probably a waste of time.
I was going to suggest that he swap out the plug wire in case he has a loose connection at the boot where it goes into the cap. It's possible the movement of pushing on the cap is causing the wire to make a temporary connection.

John
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  #9  
Old 10-12-2017, 12:16 AM
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I would not assume anything, even though some parts are "new".

Included in that comment is the distributor itself. I would take the cap and rotor off, grab the shaft and see if I could feel any side to side play in it. This would indicate poor bearings. Such in turn can cause odd timing.

Are you certain the cap is sitting squarely and correctly on the distributor body ? A small bit of sloppy plastic could prevent this. Hold it upside down beside your old one and compare.

I would certainly buy another cap/rotor from a different source and try them. Short money. Never know how well/poorly the others were made.

check the spark plug wires for routing. Separate with the little plastic gizmos as best you can. Odd things can happen between them.

But definitely try another cap & rotor . . .

john
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  #10  
Old 10-12-2017, 09:41 AM
Geoffreybusuttilmalta Geoffreybusuttilmalta is offline
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thanks for all the replies. dont worry jon pizzi maybe i found u in a bad moment yesty.. definetly will buy another cap and rotor... besides birdsnest... is there any other reliable source for buyin such things for my 352 ?...

coz the only places i buy from is birdsnest and rockautoo

regards

geoffrey
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