Is it possible that disconnecting battery causes a misaligned throttle body, which in turn causes the EPC light to come on? And does a misaligned throttle body also cause misfiring cylinders (1 & 2 in this case)?
View 3 RepliesSo I have a 2004 jetta GLI (1.8T) with forge splitter valve and short ram intake. I went and got my codes pulled and all 4 cylinders misfiring and random misfires. I replaced both coil packs and spark plugs. check engine light popped up again after about 20 miles and same thing. I just bought the car so I'm not sure how long it has been running with these misfires. I just got the timing belt replaced. I know it could be off a tooth. (Wouldn't a code pop up though for it?) How could I check that. And I also took my MAF sensor off as well and no change. Heard it could be clogged cat, any way to check? I've also cleaned the throttle body. It runs fine when I'm driving, just a rough idle.
View 15 RepliesMy friend has 2000 12v vr6 auto and recently he experienced his car bogging under acceleration. He had the plugs and wires recently done to solve the problem and the problem went away for a day and has since returned. I scanned it and here are the codes that its threw. After doing some research i'm thinking its the coil pack, since it was pretty foggy/damp today (when the problem started again).
17626.p1218 - fuel injector for cylinder 6 (N84): short to b+
16690.p0306 - Cylinder 6 Misfire Detected
16684.p0300 - Random/Multiple Cylinder Misfire Detected
So last night i was driving and i made a turn onto the highway and speed up to pass this slow ass car :thumb down: and as i did i lost acceleration and my car started to rumble like when you use a high gear when u make a turn while moving that slow acceleration. And as that happened my engine light turned on and my EPC so i drove it well barely made it home. i had a friend with his VAGCOM come to see whats wrong it said cylinder 1&3 are miss firing so he took his ignition coils out of his car swapped them in my car and we drove it around and it drove fine and no fault codes. so now my issue since i have GIAC, CAI and APR full exhaust if my warranty will cover to have them put new ignition coils since i did get an extended warranty. I'm just afraid they won't.
View 7 RepliesSo a few days ago my engine developed a misfire, flashing MIL light etc...long story short it was cylinder 5's ignition coil. When we scanned it, we picked up a misfire on cylinder 5, and a slight misfire on cylinder 1. Replaced the coil, as well as new spark plugs, cleared the codes, and everything was peachy.
NOW, driving home today.....once again. Misfire, MIL light etc. I'm not a mechanic so I am wondering if it is common for all the coils to go around the same time, or if this is probably just cylinder 1 now going. I'm going to once again get it scanned, but before then...is there anything that could cause ignition coils to just start going bad, other than age.
My 9-2 is misfiring on cylinders 2 and 4. At first we suspected a timing issue but that doesn't appear to be the case. My mechanic is looking at it but can't seem to locate the problem... so far:
- replaced old spark plugs
- checked the coils (moved them to see if the misfiring followed the coils--it did not)
- checked the timing belt (all good)
- compression is good
- fuel coming in is rich
He's dropping the exhaust today to check things from that end... A faulty mass airflow sensor wouldn't effect specific cylinders would it? and we'd see a degradation in the fuel richness right?
According to the OBDII, I have a misfire on #3 & #4 cylinders. Im getting codes PO300, PO303, PO304 and PO171.
View 2 RepliesI have a 2005 Toyota Avalon Limited with 106k miles. Check engine light detected Cylinder misfire in cylinders 3 and 4 at 99K even though I didn't feel the car driving any differently. At the time I was planning to drive the vehicle across the country and so maybe I freaked out, but a friend and I replaced all the spark plugs and coils at the same time (I knew the back 3 were a real pain).
Then at around 104K miles (after letting car sit for 8 weeks) I noticed my car was jumping a bit while idling at lights and the RPMs would dip about 50-100. It felt like I was running out of gas even though the tank was full. For the last 2k miles the idle problem has gotten slightly worse and I think I can even detect a misfire while driving in hilly terrain (although this could just be the oft complained about jerking transmission issues that plague the Avalon). There is NO check engine light illuminated and no codes.
what may be causing my car's idle to dip? It can't be the new plugs and coils already can it? How can I tell if there is a leak somewhere or if the fuel injectors are dirty?
A couple of months ago I replaced my coils because of misfires. Just yesterday I satarted getting the running in 3 cylinders feeling. So I was woundering why they went out so fast? (Coils were from my brothers 20th gti)
View 5 Replies2000 Excursion V10.
Recently cylinders 1,2,3,4 wend dead on my wife's Excursion. I searched here for a pin out diagram so I can check all the wires from the coils to the PCM. I changed the coils on those 4 cylinders with no change and then swapped them with the coils on the left side of the engine. the problem stays on those 4 cylinders. Any link to pin out the wire harness for the coils to the PCM
2001 VR6 GTI....
Already done:
Replaced the coil pack and plugs
Measured resistance of plug wires (all at about 6K Ohm)
Replaced front O2 sensor
Replaced purge solenoid valve
Replaced coolant temp sensor
Replaced fuel filter
Replaced fuel pressure regulator
Replaced MAF sensor
Cleaned the throttle body
Cleaned the throttle position sensor
Ran a tank of seafoam treatment (injectors were new 6 mos ago.)
Checked running voltage of battery
It was smoking and stinking bad with a rich mixture. It improved with the MAF change but still runs like a farm tractor. Now it idles on 3 or 4 cylinders, runs rough through 3000 RPM then runs cleaner at above 3000 RPM, but only at light throttle. CEL is either on or flashing when driving.
Don't know what to do next - nice car not fun to drive like this. What this could be and how to test it?
I am having a recurring problem, My engine keeps misfiring. I have replaced the spark plugs, ignition coils and pcv valve with all new parts and and fixed it for a little bit but now my car is misfiring again, and Im hoping its not the head so need to narrow down what the problem is...
View 1 RepliesSo leading up to today ive had some bucking under load which felt like misfiring to me. I borrowed my friends VCDS cable, checked MAF, checked o2 sensors, checked cat. They are all good. This problem is constant but i did get a misfire code once (random, cyl 1, 2, and 3). I cleared the code and they never came back.
Today as im driving home from work, the bucking problem was much worse. Then the CEL came on. I just checked the code, and it was system too lean. I cleared the code and now the car will not start. It cranks, shows rpm on VCDS and sputters but doesnt even come close to starting.
1995.5 Jetta VR6
Misfire cylinder 1 and random misfiring
P300 P301 Vagged it and can't figure it out
Changed the plugs, wires, and coil pack Used and old timing light and getting spark in all wires so can't be the coil pack
Fuel injector, O2 sensor, any other things?
So as I was heading out the other day, the car had low acceleration and engine shaking. The check engine light started flashing.
Checked the codes at the parts store: P0300, P0301, P0303.
I just dropped it off at the auto repair shop.
Could it be a I'm just wondering if I shouldn't have taken it to the dealer as the printout says it could be a CPU issue?
So my 2008 accent is my daily driver. I'm nearing the 300,000 mile mark but the last 100,000 miles have been plagued with random multiple misfires. I have changed the cables, crankshaft sensor, plugs, and I've been through numerous costly coils (I keep 4 with me). All listed parts were most recently changed at the same time. Why do I misfire on nearly every commute and get stuck operating on 3 cylinders?
View 11 Replies97 F150 4x4 XLT 5.4L... I had two cylinders misfiring, removed COP, injectors and plugs. Reinstalled all parts and reconnected all sensors. Now I am not getting fuel to the injectors. Double checked for disconnected wires and hoses, checked all fuses and relays, also the inertia switch. Fuel pump does not hum when key turned on. Tried hitting bottom of gas tank. My question is, before I pull the tank again, is there something under the hood I may be missing. It does get quite crowded at the rear of the motor.
View 6 RepliesI just bought a 05 1.8T Jetta 116,000miles. and need diagnosing it. It misses all the time. Has new plugs I tried two other sets of coils (from my 2.0 a4 and my dads passat) and it made no difference. The SAI was taken out but nothing is blocked off. Also the coil pack wiring harness has cracks on the big brown wire where it goes down along the block. I'm getting these codes on my vag-com.
16687 cylinder 3 misfire
16686 cylinder 2 misfire
16688 cylinder 4 misfire
17766 cylinder 2 open ignition circuit
17763 cylinder 1 open ignition circuit
17769 cylinder 3 open ignition circuit
17772 cylinder 4 open ignition circuit
So am I correct in thinking that it's from the cracked harness? An not a vac leak?
I have a mk4 1.8t Gti. Recently I have been having issues with idle and boost. I read the codes and multiple random misfires in all 4 cylinders came up, idle control and the crank, knock, and o2 sensor came up. Shows that system is running to lean as well. I changed the spark plugs and wires, check the coil packs they where done about 1k miles so I expect them to be perfectly fine. When I clear the codes it idles below 9-8k rpms. I also noticed the breather hose coming out of the valve cover into the EGT has a hole melted into it, could this cause any of my issues?
View 2 RepliesSo my daughter's 2000 Golf Mk4 with 160,000 miles on it was running rough and had 3 codes stored - cylinders 2 & 3 misfire and a 411 secondary air injection problem.
Having had the misfire code before I swapped injectors around and the error code moved cylinders with the injectors so I attempted cleaning them and also cleaned the throttle body and intake manifold. At this point car still running rough but also started smoking badly.
Replaced the following items:
- Spark plugs
- Spark plug wires
- PCV valve
- PCV hose
- Fuel injectors w/ remanufactured
Hose reconnected between secondary air injection pump and air intake - previous owner had duct-taped it in when he couldn't get it to seal I guess. I've never heard it run.
Car running better, idles more smoothly, doesn't stumble or stall like it did before, no error codes coming up BUT car smokes a lot and the fumes make me feel sick just driving it a mile.
The car had never smoked like this before, hasn't had a whole lot of love the last year or two but no real problems either so why the sudden smoke?
At first I assumed it was cleaner being burned off but that should have been gone in under a minute and this is on-going. It's bad enough to not only be embarrassing but apparently dangerous as the fumes are bad.
I have a 2001 golf with a 2.0 AVH engine. I recently replaced the coil-pack and was very pleased that the engine was running better, the only problem was the mpg was still kinda low in the 24-5 range when it used to be 29.
I tried to do a compression test but I didn't prepare properly, I thought you left the coil pack plugged in and the fuel fuse. Now I have a CEL that *was* flashing saying cylinder one is misfiring though it has stopped flashing. I drove it 13 miles home and it did improve but its still running rough. Very reminiscent of when my bad coil pack was still in there, a real lack of power.
So I have to ask, what can I do from here? Have I damaged my coil pack or cylinders? Will this likely go away on its own? Is there anything I should do?