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Old 06-10-2012, 08:19 PM   #1
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Default strong engine miss

I have a 96 that I bought less than a month ago. About a week ago It began missing strongly in the 1st mile or so after starting it every day. It would settle down after that, but would occasionally still miss when cruising at 2500 to 3500 rpms.

Last week it got worse. After about a mile and a half I come to a stop sign on my way to work. It died two days in a row at exactly this spot. Upon starting it, the Check Engine Light would be on. Id drive it another 1/4 mile and it would settle down.

I changed the plugs and wires and seafoamed it, but nothing helped.

Today I changed the fuel filter. It started fine and i didnt have my normal missing and surging in the first mile, but now it misses continuosly as I drive.

What would my next step in the diagnosis process be?
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Old 06-11-2012, 03:39 AM   #2
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Originally Posted by tuck4x4 View Post
I have a 96 that I bought less than a month ago. About a week ago It began missing strongly in the 1st mile or so after starting it every day. It would settle down after that, but would occasionally still miss when cruising at 2500 to 3500 rpms.

Last week it got worse. After about a mile and a half I come to a stop sign on my way to work. It died two days in a row at exactly this spot. Upon starting it, the Check Engine Light would be on. Id drive it another 1/4 mile and it would settle down.

I changed the plugs and wires and seafoamed it, but nothing helped.

Today I changed the fuel filter. It started fine and i didnt have my normal missing and surging in the first mile, but now it misses continuosly as I drive.

What would my next step in the diagnosis process be?
What is CEL code

Also miss can be coils. the end.
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Old 06-11-2012, 06:26 AM   #3
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probably coils or rarely an injector. I had an intermittent misfire which went would come and go when jiggling wires around until it was a consistent misfire later. It ended up being more than one coil in my COPS setup. I must have fried them when I forgot to disconnect them when while upgrading a megasquirt firmware
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Old 06-11-2012, 11:33 AM   #4
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finally threw a code. p1345
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Old 06-11-2012, 11:56 AM   #5
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finally threw a code. p1345
appears to be failing or failed CMP (camshaft position sensor)
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Old 06-16-2012, 01:10 AM   #6
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today i was leaving the car wash when the car suddenly began to backfire and the engine began bucking massively.

I pulled over and and turned the car off then restarted it, and it ran fine for about 2 minutes. I put it in 1st and almost immediately it began backfiring again. I restarted it a few times and noticed that it would idle fine until I hit the brake. Then it would run rough until finally dying.

A kwik kar was close so i used their obd2 reader and it showed the following codes: p0120, p0335, p0443, p1195, p1345, p1402.

EGR valve and crankshaft and camshaft sensors.

I had washed my engine, although I thought Id been very careful to bag the alternator and use wd40 on wiring, and only use low pressure water, i found water in the Camshaft sensor connector and used compressed air to blow it out. I also took the time to blow any water out of all the other wiring connectors i could find.

After doing this, the car started fine and ran for about 5 minutes. I took it for a drive, and it died 2 minutes later, and this time would not restart. It turns over, fires once or twice, but will not stay on.

I checked the Crankshaft sensor near the front pulley and discovered that the wire was worn from rubbing the belts, exposing the wiring.

To my ears, ( im used to chevy 350s with distributors), it sounds like a timing issue, but how can I tell a Crankshaft sensor issue from a camshaft sensor issue? I can get a Crankshaft sensor for $60, but the camshaft sensor is about $300.
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Old 06-16-2012, 01:49 AM   #7
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tps/crank position/evap/AFM/crank position/egr

sounds like you may have a big wiring issue. btw, i assume the engine was cold when you washed it?

let it dry for a day, and see if it will start, after starting, try using a spray bottle, and spray the plug wires, then the coil, and see if it starts acting up
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Old 06-16-2012, 03:35 AM   #8
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yeah, if you washed the engine, better check those spark plug wells too
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