i have a 95 that im having problems with.

i can pin the car at WOT whether sitting still or driving and bogs all the way down to where it starts misfiring off it sounds like 3 cylinders
it hesitates under any slight aggressive throttle touch i cant even roll into it hard it makes this poppy sound like its misfiring or not firing at all and the revs drop slowly if i hold it..if i let out it will run normal again this is a daily driver and i wouldnt have posted here if i could get an answer anywhere else...
cr.net isnt doing me any good
and neither is m.net
getting a #1 code
#1-Ignition Signal

plugs-new
wires-roughly only 9-10k miles on them
MAF-new
coil pack-new

gladly appreciate any help

 

Have you searched that code? Could be a problem with the CAS.

Check your grounds. The main grounding strap on the driver's side of the engine. Also check the ECU grounds on the back of the head. (At least that's where they are on a 1.6. I'm honestly not sure where they are on a 1.8.)

Also, how is your vacuum? Does the car idle okay?

Was this a clear out of the blue problem, or did it happen after making any changes to the car?

 

Normally I would say you're experiencing a lean condition.
Are you NA? Is the car basically stock? If not what type of fuel management of EMS are you running. Need a little more info. If your ignition system is all new then that shouldn't be a problem. Does the car run just fine when you're not hammering on it? Have you cleaned up all of your electrical connections, primarily your grounds, including the battery.

 

easy one. its the stock FPR on the fuel rail. try clamping the return fuel line closed and taking it for a spin. if its better then your FPR isn't working properly. take it off, clean it, or replace it.

or cas

 

its N/A no forced induction ever put on the motor ever..

it has simple bolt ons
intake
header
catback
stock fuel system and engine management
only 120k miles on the car
cleaned and regrounded all the engine grounds
this problem started just out of the blue
it idles fine and runs fine if i dont stab the throttle, i have to be UBER delicate with how much throttle i give or it bogs out and makes a poppy sound under the hood as if the fuel is igniting off the header.

 

Clogged fuel filter or line?

 

That really, really sounds like a ground. My 91 did that w/o the chassis-to-engine ground connected. Anything past half throttle and it'd barely move BUT that was only under load. Free revving was fine. Have you put a timing light on it to see what the IGN is doing at the areas prone to misfire?

 

Fuel system... Fuel pump.. FPR..filter.. run down the line.

 

even though your wires are new, try some known good ones. Also take a look at your plugs to see what color they are.

 

Start with the basics and narrow it down.

Are the pops coming out of hte intake? If so it could be a clogged cat.
Do you have fuel at all?
Are you getting spark at all?
Is the fuel filter clogged?
What's your base timing like?
What do the plugs look like?
Did this start happening after you changed something? Like the MAF?
List everything that was changed and the order you changed it, even if it doesn't seem related.

 

he replaced the plugs, coils, MAF after the problem started
i had him check the CAS ans cas harness, found one foul wire in harness, isolated it but problem still there, so thats not it
i think he ran a test on the CAS so i doubt thats it, but im not sure...

now that i think about it, i did have a similar problem about 4 years ago, new fuel filter did it.
the rattling sound could be ping/knock maybe, due to lean condition...
fuel filter is cheapest to replace, so i would start there
also, i have a spare fuel rail and FPR if you want to test that out...
let me know, ill be up there sunday

 

What's the code you get if you forget to reconnect (or have a bad connection) at the MAF?

Mine stumbled like that, but I got it home and started checking, only to discover it wasn't snapped in all the way, and was making only partial a connection. Plugged it in firmly, and the problem went away.

 

he has code 1=ignition signal, i think this is a separate issue for him...just a bad ignition switch, nothing to do with car bogging, leaning out, stalling...
im leaning more to the fuel now

 

Well, then I stand by my earlier diagnosis of clogged filter!

 

fuel filter and pump are only about a year old...
spark plugs are golden/brown
and i am getting power/signal from the ECU to the CAS i tested the harness connector so i dont believe its a wiring issue such as an open in the circuit and i cleaned and reground all the engine to chassis grounds

 

What about timing? Belt could have jumped, seen that before.

 

Hook up a fuel pressure gauge and clamp the line, that will tell you if the pump/filter are an issue. If that isn't it, move on to the FPR.

 

checked timing 2 days after the problem arose and timing is fine.

 

A jumped timing belt won't show up as bad timing.

 

well the reason im not worried whether or not it jumped a tooth is because ive experienced the car jumping a tooth and im confident id know if it did due to prior experience