[:@]Help please I put sparkplugs(bosch platnum)& Mopar performance plug wires on my 2002 neon se on friday. That seemed to fixed my misfire/hesitation problem that i was having, worked awsome till sunday now I have a severe bog in all gears. I filled up with gas on thursday same place i alway buy my gas. I don't know if it would be water in the gas or not but it started after driving about 80kms after filling up. It seems to get worse as it warms up[the engine]. I've never had problems with the gas from this place before but it has rained alot around here lately. I tried the key on-off-on-off-on & no codes come up on the display not even the word "done" just the odo reading. The cel light is not on so i'm thinkig that there are no codes to retreave but i thought it should still show done after the cycle. The car is a 02 neon 2.0L 5spd w/56000kms. Going to put some different gas in today see if it helps.


dodgefreak1

 

First off get those platinum plugs out NOW! They are admitted by the manufacturer to not be DIS Ignition compatible. Use regular 'Ol copper plugs and see where you are at then. Might have started eroding the platinum already on two plugs causing your gap to get way too big.

 

Yea.

Get those nasty platys out and put some nice porrer ones in. Gap them properly though if need be.
Next, run some water remover through the Gas system.
Check the air filter. Make sure its clean and air flows freely.
Check the oil.
If its over 4.500 change it out.

I just dumped some Synth in mine and she runs beautifuly now.
(same car as yours, 02 5spd auto)

 

Thanks for the advice guys I swapped the plugs today for copper core, still bogs when accelerating through all gears, also it feels like a ?misfire? in 2nd under load eg.taking off on a hill normal throttle. The air filter was already replaced 1000kms ago, oil was changed last week. I've had the car to the dealer several times in the last month but they can't find any problems, they even tried flashing pcm no change. I also put a new throttle position sensor on it a couple weeks ago it helped but no cure yet. Still open to sugestions thanks agian for the advice so far.

Also filled tank with shell 91 octane+methal hydrate+ some lucas fuel conditioner drove hard for aprox 100kms no real change



dodgefreak1

 

if there was even 1 tiny misfire the CEL light would pop on faster than it takes for your brain to figure out you thought you heard/felt a misfire

 

See what a map sensor costs. Could be out far enough (oil contaminated) to cause drivability problems without being out of limits. It works in conjunction with TPS to check airflow for engine load and fuel needs. If out of whack nothing works right.

Quote **** From ALLPAR.COM

You can check the MAP sensor by putting your multi-meter (digital) leads on the top and center terminal and disconnecting the vacuum line to the MAP sensor, then attach a vacuum source such as a hand operated vacuum pump. Pump to 5-inches of mercury, record the voltage. Then slowly increase the vacuum to 20-inches of Hg. If the voltage goes from low to high smoothly then the MAP is probably OK. If not record the voltage @ 20-inches of Hg. subtract the first reading from the second one. The difference should be 2.39 to 2.59 volts or so, if not then the MAP sensor is bad. ... you can also check for computer codes.

I think your first place to look for problems is the vacuum lines in the engine compartment. Look at your codes, two are pointing to a vacuum problem, and if the MAP has a vacuum leak then it will not change, and therfore not match the operation of the TPS, which is your third code. And with the P0108 code, your MAP may also be defective. Lasly the oxygen sensor is probably OK, just a byproduct of one of the other suggested problems.

Check your ground connections, they may be corroded or just not making a good connection. Clean them up, scrape mating surfaces with a knife to make shinny and then reconnect.

Electricaly the MAP and the TPS work similarly. Both have a 5-volt input, both have a sensor ground and both have a signal return. The MAP increases the return voltage as the pressur (vacuum) increases. At zero vacuum the voltage should be around 0.5-Vdc, and at 15-inches of vacuum the return voltage will be about 4.5-Vdc. As for the TPS the closed throttle position will return about 1-Vdc and the WOT position will reurn about 3.5-Vdc. In both cases one should look for a very smoith increase in voltage as etither th throttle is opened, or vacuum is applied to the MAP sensor.

 

There are no codes showing on display. I'll check into the map sensor in the next couple of days. I did replace the TPS a couple weeks ago & it made no difference but I'll definetly check the map sens. & the grounds I did quickly look at the ground straps they are all connected & don't look too bad but I'll clean them up just to be safe.
Thanks

dodgefreak1