Question about 1998 Mitsubishi Eclipse

1 Answer

98Eclipse 2.0 nonTurbo 5speed 180,000 miles ,code PO301

New timing belt put on last summer after bearings in tensioners came apart. Was running fine,then started stalling out at red lights giving code for EGR insufficient flow. Put on new Autozone EGR valve and ran better,but check engine came on PO301. Had new plugs & wires on engine. Put on new power pack, not much different. Replaced #1 spark plug. Plug is not burning nice gray/brown like plugs 2-3. On this engine the resistence in OHMS of the plugs and wires must be closely matched on 1&2 AND 3&4 for the engine to run right. There is a intermitent miss at low RPM 1000-2500 when you accellerate, and CK ENG lite comes back on. At the worst,engine will miss and backfire(pop) when you accellerate. If you accellerate gently it is not too bad. Runs fine at high RPM 3-5K. Could it be a injector or fuel problem or back to wires & plugs????

Posted by on

  • jhaydu Jan 05, 2009

    Have checked the compression of cylinder #1  and it is 175-180 lbs and holds. Now also gota PO420 code catalyst is below threshold along w/ PO301 #1-misfire. Engine now runs much better w/ resistance of plugs and wires closely ballanced. ANY OTHER IDEAS??? Car has been running OK for 6 months since timing belt replaced



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.

  • Contributor
  • 4 Answers

The po301 is a misfire code. The backfire can be caused by a excessive amount of fuel, bad valve timing etc.
My guess is you have damage to an exhaust valve that may have occurred when you had the timing belt problem.A compression test will indicate if you have a leaking exhaust valve.The reason for the backfire is the exhaust valve is still partially open when the spark plug fires.

Posted on Jan 03, 2009

  • my enine is not misfiring, the sound is very good but it occassionally fails to rev more than 3000rpm this will affect the gearbox not to change as the revvs will be low. I took it for dianosis check not fault code was picked.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Why do i need to change cam belt and tensioner at the same time? is it a must

yes a new belt should have a new tension other wise they cant guarantee the belt will last another 90k miles because in the old tensioner loosing tension and possibly damaging the new belt

Aug 08, 2014 | 2002 Audi A4

1 Answer

Jumped time

A blast from the past (fav. movie)
i love caps, snaps me back to my first home computer (Northstar z80)
and my silly ASR33, printing terminal, caps only, flash ! im there....
misfires on all 6 cylinders. if patient,.
what car? what engine? what year?
1150 AFR bad.
1346 VVT says, cam is bouncing like MAD (DEVIATIONS) bank1
1349 VVT frozen, means it can change it ,but how could it if it bounces. bank 1
1351 VVT Sensor Range/Performance Problem (Bank 2)

here is my guess , your engine is????
2.5,3.0,3.3,3.4,4.0lilter engines,

new belt ,why old one snapped or shredded? or worse slipped?
my guess, bad belt setup, not timed right. or bad tensioner. bad idlers, or
or bad VVT parts, or bent head valves.

the V6 may be interference, and TOY dont say, but Gates lists most 96 and newer as Interference...engines.
i will assume it is (this is 1st deal with me, as im ,FIRST do no HARM"
and these engines , what do i do?
i do a leakdown test, just after the belt is replaced and tensioned, turning engine by hand.
if the leak down test FAILS the belt snapped and the valves did hit.
this i do everytime, it takes me, what 30 more minutes?
this act prevents further damage to head and pistons and rod bearing.
the damage can cascade fast to needing a new engine. now..
IMO, good luck.

Jan 02, 2014 | Toyota Cars & Trucks

1 Answer

Why broke the belt many time what wrong

which belt,?
the accessory belt? I must guess.
accessory belts fail for 3 reasons.
1: it is at end of life, say over 100k miles.
2: the last mech, used too much tension on it. (lazy or not ASE trained)
3: the devices the belt turns has seized bearings , overloading said belt.

there is a 4th possible but that the last mech, put it back together
wrong, and the alignment is way off.
in such a way that the pulleys do not align in a parallel plane.

easy huh?

Aug 20, 2013 | Suzuki Aerio Cars & Trucks

2 Answers

It's like a rattling loud noise that comes out from the camshaft sprockets and timing belt on my 1998 dodge caravan 2.4 engine. it started while running on the road.

Could be the timing belt tensioner. They are known to make a rattling noise when worn and/or the belt has stretched....When is the last time you had the belt serviced? They should be replaced and pulleys inspected at 100,000 miles. Gates recommends 120,000 miles on their belts. Good luck, i hope this helps.

Jul 12, 2011 | Dodge Caravan Cars & Trucks

2 Answers

What is a tensioner & how often do they break?

Tensioners are a sort of pulley that spins on a bearing that puts pressure/tension on a belt. Tensioners are recommended to be replaced about 50-60 K miles when doing routine belt service like a timing belt or serpentine belt. If they are not replaced the bearings can wear out and lock the tensioner and possibly break it.

Mar 09, 2011 | 1995 Dodge Caravan

3 Answers


There is no specified mileage. Timing chains last a lot longer than timing belts and the rate at which they wear can depend more on the frequency of oil changes and engine use or abuse. The general rule of thumb most shops go by now; if it's getting noisy, then it's time to pull the timing cover. Often times it's not the chain itself, but the chain guides that have failed. Either way, a timing chain job will involve new guides, tensioner, and chain. It's an expensive job, no need to rush into it unless you know you have something coming apart and noise is your first indicator.

Jan 17, 2011 | 2001 Ford Escape

1 Answer

Replacement vacuum pump bearing also fails in 1400 miles

This unfortunetly just sounds like one of those cases when a new part was just bad in the first place. It does happen,they are still put together by humans- I belive if you put another on, it will most likley last. From what I've read, it sound like you were carefull and dilligant in your work, and dbl checking after finished.

Aug 26, 2009 | 2007 GMC Savanna

2 Answers

If you hear a whistleing sound when you press on the gas peddle ? But after i put belt conditioner spray on the timing belt it sounds clear. but after a period of time the sound comes back

You might need a new belt, or the spring in the belt tensioner is weak and not holding the belt tight to the pulleys, in which case that will need replacing.

Jul 16, 2009 | 1997 Lincoln Town Car

1 Answer

1980 ferrari 308 gtsi timing belt and tensioner replacement

You have a high touge engine so the recomendations are generally for cars that are driven weekly at least. I would change these within ten years apart for they do age from heat

May 21, 2009 | 2003 Ferrari 308 Gtsi

Not finding what you are looking for?
1998 Mitsubishi Eclipse Logo

290 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mitsubishi Experts


Level 3 Expert

77169 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22258 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8725 Answers

Are you a Mitsubishi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides