Plugs keep fouling on recent rebuild...
#1
Plugs keep fouling on recent rebuild...
My motor keeps fouling plugs. It's a recent rebuild with 600 miles on the motor. We leaned out the PFC fuel map so the car isn't running rich, but it keeps fouling plugs. Just spent 30mins on the side of the road swapping them out for my extra set (keep them in the rear bins with a socket & ratchet...)
It's very strange. The car seems to be fine for awhile, runs smooth and nice. Then once in awhile out of nowhere the car just seems to die like its not getting fuel or spark. This happens when cruising between the 2000-3000rpm range. Once it starts to die, it will idle at 1100rpm without help but when i try to give it gas it cannot bring the rpm's up. Just giving it a little bit of constant throttle (in neutral) causes the rpm's to bounce between 1500-3000rpm. When it does this I change the plugs and that usually fixes it, but tonight, even after changing the plugs, it was still doing the same thing. I gave it a lot of gas and the rpm's shot up to 4000, then the car seemed to be OK. Was it getting flooded? Are my (stock) injectors going bad? Does the map need to be leaned out further?
I checked all the hoses - fine, oil - fine, coolant - fine, etc. The only that I can seem to identify is the plugs. Another thought was that maybe my map sensor is going bad...? Thoughts?
It's very strange. The car seems to be fine for awhile, runs smooth and nice. Then once in awhile out of nowhere the car just seems to die like its not getting fuel or spark. This happens when cruising between the 2000-3000rpm range. Once it starts to die, it will idle at 1100rpm without help but when i try to give it gas it cannot bring the rpm's up. Just giving it a little bit of constant throttle (in neutral) causes the rpm's to bounce between 1500-3000rpm. When it does this I change the plugs and that usually fixes it, but tonight, even after changing the plugs, it was still doing the same thing. I gave it a lot of gas and the rpm's shot up to 4000, then the car seemed to be OK. Was it getting flooded? Are my (stock) injectors going bad? Does the map need to be leaned out further?
I checked all the hoses - fine, oil - fine, coolant - fine, etc. The only that I can seem to identify is the plugs. Another thought was that maybe my map sensor is going bad...? Thoughts?
#9
13BREW
iTrader: (16)
I had these problem a month ago, i had to deflood the car 3x in a month..
here's some help:
1. Most common is weak compression and plug fouling from sticking seals.
2. Too much fuel being added from larger capacity injectors (which can be adjusted).
as for my car, it was too much fuel, so i adjusted it at my dynotuning session. car runs fine now. hope that helps.
here's some help:
1. Most common is weak compression and plug fouling from sticking seals.
2. Too much fuel being added from larger capacity injectors (which can be adjusted).
as for my car, it was too much fuel, so i adjusted it at my dynotuning session. car runs fine now. hope that helps.
#10
i believe the A/F range is between 12 & 14 almost all the time. keep in mind i have my rev limiter set to 4k, and also no boost controller or restrictor pill in the wastegate actuator line, so the car isn't making any boost right now. when we leaned it out so it was in the 13 - 15 range, the car wouldn't idle very well, and acceleration was kind of shaky.
#11
Mr. Links
iTrader: (1)
we were shooting for a balance between a goof A/F ratio and also smooth operation.
i believe the A/F range is between 12 & 14 almost all the time. keep in mind i have my rev limiter set to 4k, and also no boost controller or restrictor pill in the wastegate actuator line, so the car isn't making any boost right now. when we leaned it out so it was in the 13 - 15 range, the car wouldn't idle very well, and acceleration was kind of shaky.
i believe the A/F range is between 12 & 14 almost all the time. keep in mind i have my rev limiter set to 4k, and also no boost controller or restrictor pill in the wastegate actuator line, so the car isn't making any boost right now. when we leaned it out so it was in the 13 - 15 range, the car wouldn't idle very well, and acceleration was kind of shaky.
#12
the PFC came with the "base mod" map. i installed the PFC when i installed the new rebuild, so there is no way to know. even though my car has the about the same mods listed under the base mod map list, it was running like **** straight out of the box. we leaned out the map from there and it was seeming to run nice, but once in awhile the plugs would foul. like i said, its mainly the 7's and not the 9's...
#13
Mr. Links
iTrader: (1)
the PFC came with the "base mod" map. i installed the PFC when i installed the new rebuild, so there is no way to know. even though my car has the about the same mods listed under the base mod map list, it was running like **** straight out of the box. we leaned out the map from there and it was seeming to run nice, but once in awhile the plugs would foul. like i said, its mainly the 7's and not the 9's...
#14
SUPER RICER!
Join Date: Aug 2006
Location: pensacola florida
Posts: 244
Likes: 0
Received 0 Likes
on
0 Posts
I can say that i have had the same problems in the past and it happened to me just the other day. I was just cruising at around 2k and the car just went to die. And well it did. Turned it off and it seemed like it had flooded itself somehow. Just rebuilt the motor and stuff. I did not clean the injectors because they looked to be in good shape. But once again, i just had to bump the pedal to get it running fine and then it was ok from then on out. Could it be a similar problem with mine?
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM