chaparral2300

well besides cleaning up the previous owners started and failed projects i love the car, but anyhow heres where im at this week.

well first i have a speedo not working in my 87 Iroc Z, heres what ive tried so far, i have removed dash cluster, and removed the entire back part of cluster to access the back and internals of the cluster to change the bulbs, in dash, and to check to see if the speedo cale was broken, well it doesnt appear to be, so then i remvoed the yellow part mounted on back of cluster, removed it from a donor vechile, my thought was that that was the vss must of been wrong. reasembled and put back, still no speedo.

2. is my oil pressure, guage is pegged, ive gotten it to work a handful of times, so far but it really dont work, stays pegged till i turn off car,

well ive fooled with the wire under hood, with no results, removed it cleaned it cleaned oil sending unit, all the basics, even ran a seperate grouned wire to sendin well that makes guage come all way down. so im stumped on oil pressure guage.

3. just recently while drive, well actually since ive owned its throwing a check engine light, but not constantly intermittantly

4. im noticing low idea at ideal, and while driving the other day, i pushed clutch in to shift an the ideal climbs to about 2,500 and wants oe stra

5 gas guage,and again, ive done all the obvious, even located the wires under rear seat to check for proper ground, investigated the wires and found the ground to be ok i guess. ran seperte ground no chan

this is engough to start out, i have more, but if someone can help, it would be great. looking for some minor interior pieces.

937 562 1501 or stevehllsbr@aol.com

chaparral2300

WOW THIRTY PEOPLE HAVE READ THE ADVERT I POSTED, AND NOT ONE SINGLE RESPONSE TO MY PROBLEMS, IS IT CAUSE IM NEW TO THE SIGHT, OR WHAT. SHOOT I WAS HOPING LIKE HELL TO COME HOME TONIGHT SETTLE IN AT COMPUTER WITH A CUP OF COFFEE AND FIND OUT WHAT THE HELL IS AMATTER WITH MY CAR I BOUGT.

WOW IM JUST REALLY SURPRISED.

Project 3.4 Camaro

Part of your problem is expecting answers that fast, the other part is that you posted your ?s in the section generally for engine related problems, often times there are guys that know engines well, but not so much other things, try the electronics or interior section for stuff like this next time.

For the speedo, assuming its cable driven, I believe all the cars up to 89 are, just because it doesnt appear broken, doesn't mean it is not, the cable is in a tube housing, so its not like you would see if it is broke, make sure its connected to the transmission and the gauge, if it is, and the gauge does not move at all, I think the cable is broke, if it does move but is inaccurate, I would think the speedometer is bad.
2. Pegged oil pressure means gauge is toast or sending unit, can't recall which.
3. Check engine light, you will have to get someone to pull the code, can't expect anyone to be able to guess what it is, though if I had to, maybe your oil pressure sending unit...esp if it seems to be running just fine
4. no clue cause I don't know manuals, and its spelled idle....idea, and ideal, are two very different words...
5. Either the fuel tank sending unit for the fuel level is bad or the gauge is, or if not moving at all possibly a break in a wire somewhere, not an easy fix as you have to drop the tank or cut a hole in the floor....
6. Less caps spazz/freakout please......

david chambers

welcome to third gen.org,home of the instant answer to all that ails you,enjoy!

zraffz

I answer questions to the best of my ability, so does every other member. Not all of us are familiar with TPI cars, TBI cars, etc... your title wasn't specific either. I usually only chime in when it comes to motors or I stop in to read what others think can be the issue. Combined as a community we can answer anything; individually only a select few members are that intelligent.

Welcome to the forum, sorry I can't be of any help. Wiring is not my thing and when my gauges stop working I switch to aftermarkets.

chaparral2300

Well to be honest with ya, i intentially used caps, i looked over the forum and decided that engine tech seeing as my problem is coming from the engine would be a good place to post the advert on my ailment. Could be wrong on this, and always got room to be corrected. but im not sure interior is where im gonna find the answers to a question under the hood.

And i didnt really think i exspected answered to quiclky considering there are lifers on this site, that are life long mechanic to these cars. i watched looked and listend before i ever even posted to get a feal of where to post.

i have codes 22 24 33 thrown on the car, figured that out tonight, its a 1987 305 tpi Iroc Z28 those are the codes, and its not running correct by no stretch of the imagination.

the speedo is well i dont know, i removed it and found that the dash was loose in severral areas where the dash meats the plugs. behind the cluster, went to junk yard and found proper mounting nuts, fixed that problem far as being loose. i removed each guage since oil pressure works intermitendly and then peggs itself other times.

the speedo has a yellow ac delco yelow plastic sensor i changed that thininking it was the vechiles vss senso.

zraffz

Your speedo doesn't work at all? Does the cable spin? Like I said I won't be much of a help with any of your questions. I've never had luck with the stock gauges and never took the time to figure them out.

chaparral2300

can tell, if cable is spinning, what i dont understand i guess is that there is the yellow box mounted on back of guage as well as a cable running to guage, is it both, electronic and can the guage not working properly effecte the overall perfomance of the engine

JT

iTrader: (1)

On your 1987 Camaro, the speedometer itself is cable driven. There's an optical sensor in the gauge that reads that cable movement and converts it to electronic form for the other speed-sensitive things. That's part of the yellow box you see on the back of the cluster. At this point, treat the non-working speedo as any other cable-driven speedo not working. You'll want to make sure the cable is actually being driven to drive the speedo.

As far as the oil pressure gauge being pegged on the high side, I believe, if it's like the Firebird side, that it's because the connection between the sending unit and gauge is open. I would check continuity between the gauge and the sending unit wire. When the sending unit wire is grounded, the gauge should go to 0. If the gauge is doing this, then I would suspect a sending unit fault. Make sure to test this to ensure the gauge is not stuck. They sometimes can get stuck when they're pegged.

You did not indicate what the fuel gauge was doing. Pegged on full or empty?

As far as the service engine soon light, you will need to pull the stored trouble codes. It would be a pure guess as to why it's on. There's several conditions and codes that could be present to illuminate the light. Anything would be simply a guess.

chaparral2300

22 24 33 are the trouble codes

chaparral2300

and fuel guage is close to empty, while having the dash out the other day i noticed the plastic on rear of cluster and pushing in and out on cluster the gas guage went to full and let it go and it came back to empty.

JT

iTrader: (1)

Code 24 is likely because of the speedo not working. The ECM knows, based on certain other data, that the car must be in motion but the VSS is not registering. It's because your cable-based speedo isn't working. So fix the issue with the speedometer not working and this code should go away - unless there's more circuit issues.

Code 23 is a Throttle Position Sensor voltage issue. TPS may not be set correctly, or there is a circuit issue.

Code 33 is a MAF code. You may want to browse around because this code is so common, there's probably a mountain of posts about this issue. This post may help get you started on this code, but there's plenty of other sources:
https://www.thirdgen.org/forums/post...655-post2.html