1992 Chevrolet Camaro Z28 - Part 4: Hard start, stalling, rough idle issue
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- Опубликовано: 28 авг 2024
- Originally, the Z28 would sometimes run great but frequently not start or sputter and run for a short time or stall out completely when running. After the work done in this video, the vehicle has been starting and driving reliably even if it seems to be idling very slightly rough. Here is what I have done up to this point:
fuel filter,
replaced ignition control module,
tested pickup coil and the new pickup coil but left the old one in,
observed new map sensor, already in place
observed new o2 sensor, already in place
observed new coolant temp sensor already in place and then reconnected it in since it had not been since I got the car
I unplugged battery for several hours
"reset" the throttle position sensor under direction of the previous owner, car sometimes worked but still stalled out once
replaced oil pressure sender, This may have been the culprit...
moved number seven cylinder plug away from oil pressure sender ...or maybe it was this or both
Did NOT replace the coolant temp sensor nor the throttle position sensor nor the knock sensor.....yet anyway.
How to read the Service Engine Soon light:
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PDF showing how to test the ignition coil:
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From this thread:
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I have an L98 in my 90 Vett. Low mileage but like your car a speed shop did a poor tune up and installed plugs for the cast iron heads, not aluminum. Different thread length. changed the ECM to a rebuilt unit. all so it could be sold at an auction. I feel your lack of distrust for the car. Felt the same way until I had a shop smoke test the vacuum lines and low and behold two were damaged. Thanks for giving the results of your labor. With 30+ year old cars routine Maintenace like ALL filters and fluids helps to relive some anks about going somewhere in the future. Just one less concern. It can be costly when you throw parts and time at issues with the best intentions. Thanks for sharing! Look forward to your adventures with your Camaro. Hope you get some smiles per miles!
Thanks for watching and for your story!
I have a 92 Z28 5.7.
Right now the radiator has started leaking so I ordered a Champion 3 row aluminum. After two tries I’m giving up and I found evidence that it was really not a direct fit. I ordered a Cold Case from Camaro Central. They say it is a direct fit no mods needed….We’ll see. Found flakes in my antifreeze so I’m changing the water pump as well. I bought this car brand new and am passing it to my kids. I have plenty of spare parts too. I kinda don’t mind putting in new quality parts as I drive towards dependency for the kids.
@@joesausage4639 Sorry to hear about your fitment issues Hope the Cold case fits? Did you get new rubber supports for the install? Not trying to spend your hard earn money, but now's the time to get any molded hoses for the cooling system. My hoses on my 90 vett looked and felt good, but in truth they were starting to split on the ends. Kind of like the Vacuum hoses. I used to just cut the split ends off. But old hoses are still old hoses that give up the ghost when you think you got it fixed. I think you owning your Camaro from new is Really cool. It's saying a lot about finding the car you always wanted and being able to hold on to it. Hope the kids get as big a kick out of it as you!
@@tonysteppan8495
Yes, the supports look good and I might get some more from Camaro Central. The hoses aren’t that old as I had them all replaced some time back. The front hoses all will be replaced and they are younger than all the others. I’ve been replacing connections and wire protectors too. In less than a year I’m having engine out work done, I’ll have all the hoses right side and rear replaced again. I’m about to give this car to my kids and I want it in tip top shape. I also have been getting spare parts for the car from sensors to compressor, etc.
Thanks for the advice, it’s always welcome here.
I have a 1992 Chevy Camaro RS and it stalled intermittently. No mechanic could ever figure this out. There was no rhyme or reason for this to stall. Changed the gas filter and its been fine ever since.
Hey mine does the same . Runs great . Then it warms up and it wants to stall. I can see the rpm’s fluctuating .
Did u find anyway to fix it?
@@DarkWalls it’s intermittent so hard to find a diagnosis
mine was the heat censor in the intake manifold on the RS 305 tbi
I love it. Having the same no start issues with my 85.
Just bought an 92 RS with a 305 and it’s giving me the same problem plus it’s from Chicago so it has rust that i have to address but I’m glad to have it as a project
Best of luck. I'm in Chicago if you need any help
@@MindofMatter thanks but i live in Georgia the car is from Chicago but it’s here in Georgia with me
I own a 1991 Z28 with 33k miles. It’s a hard top so it has the 350 tune port engine. When I purchased it the miles were 23 k miles the problem I had were the fuel injection issues I found a good mechanic that figured it out. There is a part on the passenger side on the top of the tune port it is back toward the distributor. It was. 35 dollars it fixed my problem. I could start the car drive it but if it stalled it would not start if I shut the car off it would not start. But now that it’s repaired I haven’t had any problems or issues.
Thanks!
Gonna swap out my oil pressure sender. Having similar issues.
So what do you think your issues was, essentially? The oil sending unit?... Or did u later find the real issues? I've a 2.8 w/ a bad idle and misfire...
I know it seems unlikely but based on the results I have concluded it had to be the oil pressure sending unit. Everything else I tried seem to have no lasting effect but once I rerouted the spark plug wire away from the oil pressure sending unit the problem went away forever
Great video when it’s running well stop out in new Lenox
Based on your picture looks like you have a really nice one
@@MindofMatter i have 2 of them they are nice but always needs work but i been working on these and building them since i was 14 so if you ever run into a problem i can give you tips
@@chicagosfinestmoment4896 Much appreciated, thank you!
Probably bad gas in the tank. It probably needs a tune up also.
mine starts and runs and cuts off at redlights randomly, goes fast but once at about 75 she dies down quick
tps sensor has to be adjusted to the correct position
ended up being one of the transmission sensors unplugged, pulled the thing with the engine anyway tho
My dash look cracked jus like that😂
You have a lose ground to the computer. That will make all those problems.
Thanks for the advice. My 1992 GMC Typhoon at similar symptoms and you were very close on that diagnosis for that truck. It ended up being a loose EPROM chip in the ECU.
As for my Z28, I worked on it for a bit longer and now it is 100% reliable. I drive it all over the place even with my kid and it has not let me down!
One reason it's hard to start. in 1989 chevy done away with the cold start injector
Nice car if don't mind how much did you pay for it
@@sixeight6 I paid $3750 for it.
I did the exact same thing. I put injector cleaner and octane booster in my gas tank. And all hell broke loose. Since i did this. I d k. What to do. Its backfiring and all idling rough.
Good point....I didnt ever make the connection that the injector cleaner may have caused this. Eventually, either me moving the spark plug wire away from the fuel pump cutoff sensor fixed it or maybe just driving the car cleared out the junk I loosened up the fuel system.
I also replaced the whole distributor and it went away for a while . Now it’s back .
You got a new ignition module that lives inside the distributor when you replaced the distributor right?
If not those two, coolant temp sensor, throttle position sensor?
@@MindofMatter done the IAC
@@MindofMatter temp sensor
Need to do the oil sending unit like you . Replaced the coil too . I don’t remember if I did the ignition module.
@@chevycmf it seems weird that rerouting the spark plug wire and replacing that sender seemed to do the trick. I dunno, hard to Beleive but I can't argue with the results
I’m watching this video to see if it would help with my problem my 91 RS is hard to start once it does the rod go low and then high over and over until it stalls it self
Is it a TPI engine? As you may have seen in the video description, i replaced or checked a few things. Here is what I would try if I were you:
replace ignition control module (cheap and easy)
unplug new coolant temp sensor and see if anything changes
Replace coolant temp sensor if car works better with it unplugged
unplugged battery for several hours
"reset" the throttle position sensor
replaced oil pressure sender and check that the sparkplug wires arent interfering with this sensor
I am not a real mechanic so replacing parts is what I often try (versus testing them) but the parts are cheap so not a huge deal
I'm having this exact problem now. What was your fix?
Has it stalled on you yet?
Dead reliable since I changed the oil sensor and moved the spark plug wire. I did sell it but never gave me problems again for months afterwards
Fuel filter
One of the first things I tried but unfortunately, was not the problem
What was issue
@@jermalramsey1567 I noticed one of my spark plug wires was passing close by the oil pressure sender unit which caused sporadic poor running. At the same time I rerouted the spark plug wire I also change the oil pressure sending unit. This seemed to resolve the problem once and for all.
I read online that a drop in oil pressure as measured by that sending unit would cause the car to shut down the fuel pump to save the engine and so I think that's what was happening just sporadically off and on.
My 91 ta is acting similar but it always ran fine for 20k miles.
It's a 5.7 tpi? Make sure spark plug wire is not near the oil pressure switch underneath the car, since it's free.
Beyond that I'm not skilled or patient enough to test every component so consider replacing the cheap parts first like the module in the distributor, coolant temp or throttle sensors, or even just a basic spark plug and wires to start
Vacuum, fuel filter, dirty sensors
Thank you, I did do a vacuum test. Can't remember if I changed the fuel filter or not but if I did it didn't do anything. I did spray off some of the sensors under the hood with carb cleaner but nothing downstream of the intake valves
@@MindofMatter is this a manifold or a carb I didn’t watch the whole video. I have a 1990 with a carb conversion and it starts and runs for a minute then stalls low rpm. Vacuums we’re cracked then I saw a video where the distributor component was cracked and they guy changed it.
@@MisterRay11 fuel injected manifold
You should just sell me that car.
Put an LS3 in it. Problem solved
Have to give it a little gas to catch
Ignition control module
Tried that, didn't work
!!!!! 🤣